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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+var { seq, iterate, filter, map, reductions, reduce, count,
+ isEmpty, every, isEvery, some, take, takeWhile, drop,
+ dropWhile, concat, first, rest, nth, last, dropLast,
+ distinct, remove, mapcat, fromEnumerator, string,
+ object, pairs, keys, values, each, names, symbols
+ } = require("sdk/util/sequence");
+
+const boom = () => { throw new Error("Boom!"); };
+const broken = seq(function*() {
+ yield 1;
+ throw new Error("Boom!");
+});
+
+exports["test seq"] = assert => {
+ let xs = seq(function*() {
+ yield 1;
+ yield 2;
+ yield 3;
+ });
+
+ assert.deepEqual([...seq(null)], [], "seq of null is empty");
+ assert.deepEqual([...seq(void(0))], [], "seq of void is empty");
+ assert.deepEqual([...xs], [1, 2, 3], "seq of 1 2 3");
+ assert.deepEqual([...seq(xs)], [1, 2, 3], "seq of seq is seq");
+
+ assert.deepEqual([...seq([])], [], "seq of emtpy array is empty");
+ assert.deepEqual([...seq([1])], [1], "seq of lonly array is single element");
+ assert.deepEqual([...seq([1, 2, 3])], [1, 2, 3], "seq of array is it's elements");
+
+ assert.deepEqual([...seq("")], [], "seq of emtpy string is empty");
+ assert.deepEqual([...seq("o")], ["o"], "seq of char is single char seq");
+ assert.deepEqual([...seq("hello")], ["h", "e", "l", "l", "o"],
+ "seq of string are chars");
+
+ assert.deepEqual([...seq(new Set())], [], "seq of emtpy set is empty");
+ assert.deepEqual([...seq(new Set([1]))], [1], "seq of lonely set is single");
+ assert.deepEqual([...seq(new Set([1, 2, 3]))], [1, 2, 3], "seq of lonely set is single");
+
+ assert.deepEqual([...seq(new Map())], [], "seq of emtpy map is empty");
+ assert.deepEqual([...seq(new Map([[1, 2]]))], [[1, 2]], "seq single mapping is that mapping");
+ assert.deepEqual([...seq(new Map([[1, 2], [3, 4], [5, 6]]))],
+ [[1, 2], [3, 4], [5, 6]],
+ "seq of map is key value mappings");
+
+ [function(){}, 1, /foo/, true].forEach(x => {
+ assert.throws(() => seq(x), "Type is not seq-able");
+ });
+
+ assert.throws(() => [...broken],
+ /Boom/,
+ "broken sequence errors propagate");
+};
+
+exports["test seq casting"] = assert => {
+ const xs = seq(function*() { yield 1; yield 2; yield 3; });
+ const ys = seq(function*() { yield 1; });
+ const zs = seq(function*() {});
+ const kvs = seq(function*() { yield ["a", 1]; yield ["b", 2]; });
+ const kv = seq(function*() { yield ["a", 1]; });
+
+ assert.deepEqual([...xs], [1, 2, 3], "cast to array");
+ assert.deepEqual([...ys], [1], "cast to of one element");
+ assert.deepEqual([...zs], [], "cast empty array");
+
+ assert.deepEqual(string(...xs), "123", "cast to string");
+ assert.deepEqual(string(...ys), "1", "cast to char");
+ assert.deepEqual(string(...zs), "", "cast to empty string");
+
+ assert.deepEqual(new Set(xs), new Set([1, 2, 3]),
+ "cast to set of items");
+ assert.deepEqual(new Set(ys), new Set([1]),
+ "cast to set of one item");
+ assert.deepEqual(new Set(zs), new Set(),
+ "cast to set of one item");
+
+ assert.deepEqual(new Map(kvs), new Map([["a", 1], ["b", 2]]),
+ "cast to map");
+ assert.deepEqual(new Map(kv), new Map([["a", 1]]),
+ "cast to single mapping");
+ assert.deepEqual(new Map(zs), new Map(),
+ "cast to empty map");
+
+ assert.deepEqual(object(...kvs), {a: 1, b: 2},
+ "cast to object");
+ assert.deepEqual(object(...kv), {a: 1},
+ "cast to single pair");
+ assert.deepEqual(object(...zs), {},
+ "cast to empty object");
+};
+
+exports["test pairs"] = assert => {
+ assert.deepEqual([...pairs(null)], [], "pairs on null is empty");
+ assert.deepEqual([...pairs(void(0))], [], "pairs on void is empty");
+ assert.deepEqual([...pairs({})], [], "empty sequence");
+ assert.deepEqual([...pairs({a: 1})], [["a", 1]], "single pair");
+ assert.deepEqual([...pairs({a: 1, b: 2, c: 3})].sort(),
+ [["a", 1], ["b", 2], ["c", 3]],
+ "creates pairs");
+ let items = [];
+ for (let [key, value] of pairs({a: 1, b: 2, c: 3}))
+ items.push([key, value]);
+
+ assert.deepEqual(items.sort(),
+ [["a", 1], ["b", 2], ["c", 3]],
+ "for of works on pairs");
+
+
+ assert.deepEqual([...pairs([])], [], "pairs on empty array is empty");
+ assert.deepEqual([...pairs([1])], [[0, 1]], "pairs on array is [index, element]");
+ assert.deepEqual([...pairs([1, 2, 3])],
+ [[0, 1], [1, 2], [2, 3]],
+ "for arrays it pair of [index, element]");
+
+ assert.deepEqual([...pairs("")], [], "pairs on empty string is empty");
+ assert.deepEqual([...pairs("a")], [[0, "a"]], "pairs on char is [0, char]");
+ assert.deepEqual([...pairs("hello")],
+ [[0, "h"], [1, "e"], [2, "l"], [3, "l"], [4, "o"]],
+ "for strings it's pair of [index, char]");
+
+ assert.deepEqual([...pairs(new Map())],
+ [],
+ "pairs on empty map is empty");
+ assert.deepEqual([...pairs(new Map([[1, 3]]))],
+ [[1, 3]],
+ "pairs on single mapping single mapping");
+ assert.deepEqual([...pairs(new Map([[1, 2], [3, 4]]))],
+ [[1, 2], [3, 4]],
+ "pairs on map returs key vaule pairs");
+
+ assert.throws(() => pairs(new Set()),
+ "can't pair set");
+
+ assert.throws(() => pairs(4),
+ "can't pair number");
+
+ assert.throws(() => pairs(true),
+ "can't pair boolean");
+};
+
+exports["test keys"] = assert => {
+ assert.deepEqual([...keys(null)], [], "keys on null is empty");
+ assert.deepEqual([...keys(void(0))], [], "keys on void is empty");
+ assert.deepEqual([...keys({})], [], "empty sequence");
+ assert.deepEqual([...keys({a: 1})], ["a"], "single key");
+ assert.deepEqual([...keys({a: 1, b: 2, c: 3})].sort(),
+ ["a", "b", "c"],
+ "all keys");
+ assert.deepEqual([...keys(Object.create({}, {
+ a: {value: 1, enumerable: true},
+ b: {value: 2, enumerable: false},
+ c: {value: 3, enumerable: false}
+ }))].sort(),
+ ["a"],
+ "only enumerable keys");
+
+ let items = [];
+ for (let key of keys({a: 1, b: 2, c: 3}))
+ items.push(key);
+
+ assert.deepEqual(items.sort(),
+ ["a", "b", "c"],
+ "for of works on keys");
+
+
+ assert.deepEqual([...keys([])], [], "keys on empty array is empty");
+ assert.deepEqual([...keys([1])], [0], "keys on array is indexes");
+ assert.deepEqual([...keys([1, 2, 3])],
+ [0, 1, 2],
+ "keys on arrays returns indexes");
+
+ assert.deepEqual([...keys("")], [], "keys on empty string is empty");
+ assert.deepEqual([...keys("a")], [0], "keys on char is 0");
+ assert.deepEqual([...keys("hello")],
+ [0, 1, 2, 3, 4],
+ "keys on strings is char indexes");
+
+ assert.deepEqual([...keys(new Map())],
+ [],
+ "keys on empty map is empty");
+ assert.deepEqual([...keys(new Map([[1, 3]]))],
+ [1],
+ "keys on single mapping single mapping is single key");
+ assert.deepEqual([...keys(new Map([[1, 2], [3, 4]]))],
+ [1, 3],
+ "keys on map is keys from map");
+
+ assert.throws(() => keys(new Set()),
+ "can't keys set");
+
+ assert.throws(() => keys(4),
+ "can't keys number");
+
+ assert.throws(() => keys(true),
+ "can't keys boolean");
+};
+
+exports["test names"] = assert => {
+ assert.deepEqual([...names(null)], [], "names on null is empty");
+ assert.deepEqual([...names(void(0))], [], "names on void is empty");
+ assert.deepEqual([...names({})], [], "empty sequence");
+ assert.deepEqual([...names({a: 1})], ["a"], "single key");
+ assert.deepEqual([...names({a: 1, b: 2, c: 3})].sort(),
+ ["a", "b", "c"],
+ "all keys");
+ assert.deepEqual([...names(Object.create({}, {
+ a: {value: 1, enumerable: true},
+ b: {value: 2, enumerable: false},
+ c: {value: 3, enumerable: false}
+ }))].sort(),
+ ["a", "b", "c"],
+ "all enumerable & non-enumerable keys");
+
+
+ assert.throws(() => names([1, 2, 3]),
+ "can't names array");
+
+ assert.throws(() => names(""),
+ "can't names string");
+
+ assert.throws(() => names(new Map()),
+ "can't names map");
+
+ assert.throws(() => names(new Set()),
+ "can't names set");
+
+ assert.throws(() => names(4),
+ "can't names number");
+
+ assert.throws(() => names(true),
+ "can't names boolean");
+};
+
+exports["test symbols"] = assert => {
+ assert.deepEqual([...symbols(null)], [], "symbols on null is empty");
+ assert.deepEqual([...symbols(void(0))], [], "symbols on void is empty");
+ assert.deepEqual([...symbols({})], [], "symbols on empty is empty");
+ assert.deepEqual([...symbols({a: 1})], [], "symbols is empty if not owned");
+
+ const b = Symbol("b");
+ assert.deepEqual([...symbols({a: 1, [b]: 2, c: 3})].sort(),
+ [b],
+ "only symbols");
+
+ assert.deepEqual([...symbols(Object.create({}, {
+ a: {value: 1, enumerable: true},
+ [b]: {value: 2, enumerable: false},
+ c: {value: 3, enumerable: false}
+ }))].sort(),
+ [b],
+ "includes non-enumerable symbols");
+
+
+ assert.throws(() => symbols([1, 2, 3]),
+ "can't symbols array");
+
+ assert.throws(() => symbols(""),
+ "can't symbols string");
+
+ assert.throws(() => symbols(new Map()),
+ "can't symbols map");
+
+ assert.throws(() => symbols(new Set()),
+ "can't symbols set");
+
+ assert.throws(() => symbols(4),
+ "can't symbols number");
+
+ assert.throws(() => symbols(true),
+ "can't symbols boolean");
+};
+
+exports["test values"] = assert => {
+ assert.deepEqual([...values({})], [], "empty sequence");
+ assert.deepEqual([...values({a: 1})], [1], "single value");
+ assert.deepEqual([...values({a: 1, b: 2, c: 3})].sort(),
+ [1, 2, 3],
+ "all values");
+
+ let items = [];
+ for (let value of values({a: 1, b: 2, c: 3}))
+ items.push(value);
+
+ assert.deepEqual(items.sort(),
+ [1, 2, 3],
+ "for of works on values");
+
+ assert.deepEqual([...values([])], [], "values on empty array is empty");
+ assert.deepEqual([...values([1])], [1], "values on array elements");
+ assert.deepEqual([...values([1, 2, 3])],
+ [1, 2, 3],
+ "values on arrays returns elements");
+
+ assert.deepEqual([...values("")], [], "values on empty string is empty");
+ assert.deepEqual([...values("a")], ["a"], "values on char is char");
+ assert.deepEqual([...values("hello")],
+ ["h", "e", "l", "l", "o"],
+ "values on strings is chars");
+
+ assert.deepEqual([...values(new Map())],
+ [],
+ "values on empty map is empty");
+ assert.deepEqual([...values(new Map([[1, 3]]))],
+ [3],
+ "keys on single mapping single mapping is single key");
+ assert.deepEqual([...values(new Map([[1, 2], [3, 4]]))],
+ [2, 4],
+ "values on map is values from map");
+
+ assert.deepEqual([...values(new Set())], [], "values on empty set is empty");
+ assert.deepEqual([...values(new Set([1]))], [1], "values on set is it's items");
+ assert.deepEqual([...values(new Set([1, 2, 3]))],
+ [1, 2, 3],
+ "values on set is it's items");
+
+
+ assert.throws(() => values(4),
+ "can't values number");
+
+ assert.throws(() => values(true),
+ "can't values boolean");
+};
+
+exports["test fromEnumerator"] = assert => {
+ const { Cc, Ci } = require("chrome");
+ const { enumerateObservers,
+ addObserver,
+ removeObserver } = Cc["@mozilla.org/observer-service;1"].
+ getService(Ci.nsIObserverService);
+
+
+ const topic = "sec:" + Math.random().toString(32).substr(2);
+ const [a, b, c] = [{wrappedJSObject: {}},
+ {wrappedJSObject: {}},
+ {wrappedJSObject: {}}];
+ const unwrap = x => x.wrappedJSObject;
+
+ [a, b, c].forEach(x => addObserver(x, topic, false));
+
+ const xs = fromEnumerator(() => enumerateObservers(topic));
+ const ys = map(unwrap, xs);
+
+ assert.deepEqual([...ys], [a, b, c].map(unwrap),
+ "all observers are there");
+
+ removeObserver(b, topic);
+
+ assert.deepEqual([...ys], [a, c].map(unwrap),
+ "b was removed");
+
+ removeObserver(a, topic);
+
+ assert.deepEqual([...ys], [c].map(unwrap),
+ "a was removed");
+
+ removeObserver(c, topic);
+
+ assert.deepEqual([...ys], [],
+ "c was removed, now empty");
+
+ addObserver(a, topic, false);
+
+ assert.deepEqual([...ys], [a].map(unwrap),
+ "a was added");
+
+ removeObserver(a, topic);
+
+ assert.deepEqual([...ys], [].map(unwrap),
+ "a was removed, now empty");
+
+};
+
+exports["test filter"] = assert => {
+ const isOdd = x => x % 2;
+ const odds = seq(function*() { yield 1; yield 3; yield 5; });
+ const evens = seq(function*() { yield 2; yield 4; yield 6; });
+ const mixed = seq(function*() {
+ yield 1;
+ yield 2;
+ yield 3;
+ yield 4;
+ });
+
+ assert.deepEqual([...filter(isOdd, mixed)], [1, 3],
+ "filtered odds");
+ assert.deepEqual([...filter(isOdd, odds)], [1, 3, 5],
+ "kept all");
+ assert.deepEqual([...filter(isOdd, evens)], [],
+ "kept none");
+
+
+ let xs = filter(boom, mixed);
+ assert.throws(() => [...xs], /Boom/, "errors propagate");
+
+ assert.throws(() => [...filter(isOdd, broken)], /Boom/,
+ "sequence errors propagate");
+};
+
+exports["test filter array"] = assert => {
+ let isOdd = x => x % 2;
+ let xs = filter(isOdd, [1, 2, 3, 4]);
+ let ys = filter(isOdd, [1, 3, 5]);
+ let zs = filter(isOdd, [2, 4, 6]);
+
+ assert.deepEqual([...xs], [1, 3], "filteres odds");
+ assert.deepEqual([...ys], [1, 3, 5], "kept all");
+ assert.deepEqual([...zs], [], "kept none");
+ assert.ok(!Array.isArray(xs));
+};
+
+exports["test filter set"] = assert => {
+ let isOdd = x => x % 2;
+ let xs = filter(isOdd, new Set([1, 2, 3, 4]));
+ let ys = filter(isOdd, new Set([1, 3, 5]));
+ let zs = filter(isOdd, new Set([2, 4, 6]));
+
+ assert.deepEqual([...xs], [1, 3], "filteres odds");
+ assert.deepEqual([...ys], [1, 3, 5], "kept all");
+ assert.deepEqual([...zs], [], "kept none");
+};
+
+exports["test filter string"] = assert => {
+ let isUpperCase = x => x.toUpperCase() === x;
+ let xs = filter(isUpperCase, "aBcDe");
+ let ys = filter(isUpperCase, "ABC");
+ let zs = filter(isUpperCase, "abcd");
+
+ assert.deepEqual([...xs], ["B", "D"], "filteres odds");
+ assert.deepEqual([...ys], ["A", "B", "C"], "kept all");
+ assert.deepEqual([...zs], [], "kept none");
+};
+
+exports["test filter lazy"] = assert => {
+ const x = 1;
+ let y = 2;
+
+ const xy = seq(function*() { yield x; yield y; });
+ const isOdd = x => x % 2;
+ const actual = filter(isOdd, xy);
+
+ assert.deepEqual([...actual], [1], "only one odd number");
+ y = 3;
+ assert.deepEqual([...actual], [1, 3], "filter is lazy");
+};
+
+exports["test filter non sequences"] = assert => {
+ const False = _ => false;
+ assert.throws(() => [...filter(False, 1)],
+ "can't iterate number");
+ assert.throws(() => [...filter(False, {a: 1, b:2})],
+ "can't iterate object");
+};
+
+exports["test map"] = assert => {
+ let inc = x => x + 1;
+ let xs = seq(function*() { yield 1; yield 2; yield 3; });
+ let ys = map(inc, xs);
+
+ assert.deepEqual([...ys], [2, 3, 4], "incremented each item");
+
+ assert.deepEqual([...map(inc, null)], [], "mapping null is empty");
+ assert.deepEqual([...map(inc, void(0))], [], "mapping void is empty");
+ assert.deepEqual([...map(inc, new Set([1, 2, 3]))], [2, 3, 4], "maps set items");
+};
+
+exports["test map two inputs"] = assert => {
+ let sum = (x, y) => x + y;
+ let xs = seq(function*() { yield 1; yield 2; yield 3; });
+ let ys = seq(function*() { yield 4; yield 5; yield 6; });
+
+ let zs = map(sum, xs, ys);
+
+ assert.deepEqual([...zs], [5, 7, 9], "summed numbers");
+};
+
+exports["test map diff sized inputs"] = assert => {
+ let sum = (x, y) => x + y;
+ let xs = seq(function*() { yield 1; yield 2; yield 3; });
+ let ys = seq(function*() { yield 4; yield 5; yield 6; yield 7; yield 8; });
+
+ let zs = map(sum, xs, ys);
+
+ assert.deepEqual([...zs], [5, 7, 9], "summed numbers");
+ assert.deepEqual([...map(sum, ys, xs)], [5, 7, 9],
+ "index of exhasting input is irrelevant");
+};
+
+exports["test map multi"] = assert => {
+ let sum = (x, y, z, w) => x + y + z + w;
+ let xs = seq(function*() { yield 1; yield 2; yield 3; yield 4; });
+ let ys = seq(function*() { yield 4; yield 5; yield 6; yield 7; yield 8; });
+ let zs = seq(function*() { yield 10; yield 11; yield 12; });
+ let ws = seq(function*() { yield 0; yield 20; yield 40; yield 60; });
+
+ let actual = map(sum, xs, ys, zs, ws);
+
+ assert.deepEqual([...actual], [15, 38, 61], "summed numbers");
+};
+
+exports["test map errors"] = assert => {
+ assert.deepEqual([...map(boom, [])], [],
+ "won't throw if empty");
+
+ const xs = map(boom, [1, 2, 4]);
+
+ assert.throws(() => [...xs], /Boom/, "propagates errors");
+
+ assert.throws(() => [...map(x => x, broken)], /Boom/,
+ "sequence errors propagate");
+};
+
+exports["test reductions"] = assert => {
+ let sum = (...xs) => xs.reduce((x, y) => x + y, 0);
+
+ assert.deepEqual([...reductions(sum, [1, 1, 1, 1])],
+ [1, 2, 3, 4],
+ "works with arrays");
+ assert.deepEqual([...reductions(sum, 5, [1, 1, 1, 1])],
+ [5, 6, 7, 8, 9],
+ "array with initial");
+
+ assert.deepEqual([...reductions(sum, seq(function*() {
+ yield 1;
+ yield 2;
+ yield 3;
+ }))],
+ [1, 3, 6],
+ "works with sequences");
+
+ assert.deepEqual([...reductions(sum, 10, seq(function*() {
+ yield 1;
+ yield 2;
+ yield 3;
+ }))],
+ [10, 11, 13, 16],
+ "works with sequences");
+
+ assert.deepEqual([...reductions(sum, [])], [0],
+ "invokes accumulator with no args");
+
+ assert.throws(() => [...reductions(boom, 1, [1])],
+ /Boom/,
+ "arg errors errors propagate");
+ assert.throws(() => [...reductions(sum, 1, broken)],
+ /Boom/,
+ "sequence errors propagate");
+};
+
+exports["test reduce"] = assert => {
+ let sum = (...xs) => xs.reduce((x, y) => x + y, 0);
+
+ assert.deepEqual(reduce(sum, [1, 2, 3, 4, 5]),
+ 15,
+ "works with arrays");
+
+ assert.deepEqual(reduce(sum, seq(function*() {
+ yield 1;
+ yield 2;
+ yield 3;
+ })),
+ 6,
+ "works with sequences");
+
+ assert.deepEqual(reduce(sum, 10, [1, 2, 3, 4, 5]),
+ 25,
+ "works with array & initial");
+
+ assert.deepEqual(reduce(sum, 5, seq(function*() {
+ yield 1;
+ yield 2;
+ yield 3;
+ })),
+ 11,
+ "works with sequences & initial");
+
+ assert.deepEqual(reduce(sum, []), 0, "reduce with no args");
+ assert.deepEqual(reduce(sum, "a", []), "a", "reduce with initial");
+ assert.deepEqual(reduce(sum, 1, [1]), 2, "reduce with single & initial");
+
+ assert.throws(() => [...reduce(boom, 1, [1])],
+ /Boom/,
+ "arg errors errors propagate");
+ assert.throws(() => [...reduce(sum, 1, broken)],
+ /Boom/,
+ "sequence errors propagate");
+};
+
+exports["test each"] = assert => {
+ const collect = xs => {
+ let result = [];
+ each((...etc) => result.push(...etc), xs);
+ return result;
+ };
+
+ assert.deepEqual(collect(null), [], "each ignores null");
+ assert.deepEqual(collect(void(0)), [], "each ignores void");
+
+ assert.deepEqual(collect([]), [], "each ignores empty");
+ assert.deepEqual(collect([1]), [1], "each works on single item arrays");
+ assert.deepEqual(collect([1, 2, 3, 4, 5]),
+ [1, 2, 3, 4, 5],
+ "works with arrays");
+
+ assert.deepEqual(collect(seq(function*() {
+ yield 1;
+ yield 2;
+ yield 3;
+ })),
+ [1, 2, 3],
+ "works with sequences");
+
+ assert.deepEqual(collect(""), [], "ignores empty strings");
+ assert.deepEqual(collect("a"), ["a"], "works on chars");
+ assert.deepEqual(collect("hello"), ["h", "e", "l", "l", "o"],
+ "works on strings");
+
+ assert.deepEqual(collect(new Set()), [], "ignores empty sets");
+ assert.deepEqual(collect(new Set(["a"])), ["a"],
+ "works on single item sets");
+ assert.deepEqual(collect(new Set([1, 2, 3])), [1, 2, 3],
+ "works on muti item tests");
+
+ assert.deepEqual(collect(new Map()), [], "ignores empty maps");
+ assert.deepEqual(collect(new Map([["a", 1]])), [["a", 1]],
+ "works on single mapping maps");
+ assert.deepEqual(collect(new Map([[1, 2], [3, 4], [5, 6]])),
+ [[1, 2], [3, 4], [5, 6]],
+ "works on muti mapping maps");
+
+ assert.throws(() => collect({}), "objects arn't supported");
+ assert.throws(() => collect(1), "numbers arn't supported");
+ assert.throws(() => collect(true), "booleas arn't supported");
+};
+
+exports["test count"] = assert => {
+ assert.equal(count(null), 0, "null counts to 0");
+ assert.equal(count(), 0, "undefined counts to 0");
+ assert.equal(count([]), 0, "empty array");
+ assert.equal(count([1, 2, 3]), 3, "non-empty array");
+ assert.equal(count(""), 0, "empty string");
+ assert.equal(count("hello"), 5, "non-empty string");
+ assert.equal(count(new Map()), 0, "empty map");
+ assert.equal(count(new Map([[1, 2], [2, 3]])), 2, "non-empty map");
+ assert.equal(count(new Set()), 0, "empty set");
+ assert.equal(count(new Set([1, 2, 3, 4])), 4, "non-empty set");
+ assert.equal(count(seq(function*() {})), 0, "empty sequence");
+ assert.equal(count(seq(function*() { yield 1; yield 2; })), 2,
+ "non-empty sequence");
+
+ assert.throws(() => count(broken),
+ /Boom/,
+ "sequence errors propagate");
+};
+
+exports["test isEmpty"] = assert => {
+ assert.equal(isEmpty(null), true, "null is empty");
+ assert.equal(isEmpty(), true, "undefined is empty");
+ assert.equal(isEmpty([]), true, "array is array");
+ assert.equal(isEmpty([1, 2, 3]), false, "array isn't empty");
+ assert.equal(isEmpty(""), true, "string is empty");
+ assert.equal(isEmpty("hello"), false, "non-empty string");
+ assert.equal(isEmpty(new Map()), true, "empty map");
+ assert.equal(isEmpty(new Map([[1, 2], [2, 3]])), false, "non-empty map");
+ assert.equal(isEmpty(new Set()), true, "empty set");
+ assert.equal(isEmpty(new Set([1, 2, 3, 4])), false , "non-empty set");
+ assert.equal(isEmpty(seq(function*() {})), true, "empty sequence");
+ assert.equal(isEmpty(seq(function*() { yield 1; yield 2; })), false,
+ "non-empty sequence");
+
+ assert.equal(isEmpty(broken), false, "hasn't reached error");
+};
+
+exports["test isEvery"] = assert => {
+ let isOdd = x => x % 2;
+ let isTrue = x => x === true;
+ let isFalse = x => x === false;
+
+ assert.equal(isEvery(isOdd, seq(function*() {
+ yield 1;
+ yield 3;
+ yield 5;
+ })), true, "all are odds");
+
+ assert.equal(isEvery(isOdd, seq(function*() {
+ yield 1;
+ yield 2;
+ yield 3;
+ })), false, "contains even");
+
+ assert.equal(isEvery(isTrue, seq(function*() {})), true, "true if empty");
+ assert.equal(isEvery(isFalse, seq(function*() {})), true, "true if empty");
+
+ assert.equal(isEvery(isTrue, null), true, "true for null");
+ assert.equal(isEvery(isTrue, undefined), true, "true for undefined");
+
+ assert.throws(() => isEvery(boom, [1, 2]),
+ /Boom/,
+ "arg errors errors propagate");
+ assert.throws(() => isEvery(x => true, broken),
+ /Boom/,
+ "sequence errors propagate");
+
+ assert.equal(isEvery(x => false, broken), false,
+ "hasn't reached error");
+};
+
+exports["test some"] = assert => {
+ let isOdd = x => x % 2;
+ let isTrue = x => x === true;
+ let isFalse = x => x === false;
+
+ assert.equal(some(isOdd, seq(function*() {
+ yield 2;
+ yield 4;
+ yield 6;
+ })), null, "all are even");
+
+ assert.equal(some(isOdd, seq(function*() {
+ yield 2;
+ yield 3;
+ yield 4;
+ })), true, "contains odd");
+
+ assert.equal(some(isTrue, seq(function*() {})), null,
+ "null if empty")
+ assert.equal(some(isFalse, seq(function*() {})), null,
+ "null if empty")
+
+ assert.equal(some(isTrue, null), null, "null for null");
+ assert.equal(some(isTrue, undefined), null, "null for undefined");
+
+ assert.throws(() => some(boom, [1, 2]),
+ /Boom/,
+ "arg errors errors propagate");
+ assert.throws(() => some(x => false, broken),
+ /Boom/,
+ "sequence errors propagate");
+
+ assert.equal(some(x => true, broken), true,
+ "hasn't reached error");
+};
+
+exports["test take"] = assert => {
+ let xs = seq(function*() {
+ yield 1;
+ yield 2;
+ yield 3;
+ yield 4;
+ yield 5;
+ yield 6;
+ });
+
+ assert.deepEqual([...take(3, xs)], [1, 2, 3], "took 3 items");
+ assert.deepEqual([...take(3, [1, 2, 3, 4, 5])], [1, 2, 3],
+ "took 3 from array");
+
+ let ys = seq(function*() { yield 1; yield 2; });
+ assert.deepEqual([...take(3, ys)], [1, 2], "takes at max n");
+ assert.deepEqual([...take(3, [1, 2])], [1, 2],
+ "takes at max n from arary");
+
+ let empty = seq(function*() {});
+ assert.deepEqual([...take(5, empty)], [], "nothing to take");
+
+ assert.throws(() => [...take(3, broken)],
+ /Boom/,
+ "sequence errors propagate");
+
+ assert.deepEqual([...take(1, broken)], [1],
+ "hasn't reached error");
+};
+
+exports["test iterate"] = assert => {
+ let inc = x => x + 1;
+ let nums = iterate(inc, 0);
+
+ assert.deepEqual([...take(5, nums)], [0, 1, 2, 3, 4], "took 5");
+ assert.deepEqual([...take(10, nums)], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], "took 10");
+
+ let xs = iterate(x => x * 3, 2);
+ assert.deepEqual([...take(4, xs)], [2, 6, 18, 54], "took 4");
+
+ assert.throws(() => [...iterate(boom, 0)],
+ /Boom/,
+ "function exceptions propagate");
+};
+
+exports["test takeWhile"] = assert => {
+ let isNegative = x => x < 0;
+ let xs = seq(function*() {
+ yield -2;
+ yield -1;
+ yield 0;
+ yield 1;
+ yield 2;
+ yield 3;
+ });
+
+ assert.deepEqual([...takeWhile(isNegative, xs)], [-2, -1],
+ "took until 0");
+
+ let ys = seq(function*() {});
+ assert.deepEqual([...takeWhile(isNegative, ys)], [],
+ "took none");
+
+ let zs = seq(function*() {
+ yield 0;
+ yield 1;
+ yield 2;
+ yield 3;
+ });
+
+ assert.deepEqual([...takeWhile(isNegative, zs)], [],
+ "took none");
+
+ assert.throws(() => [...takeWhile(boom, zs)],
+ /Boom/,
+ "function errors errors propagate");
+ assert.throws(() => [...takeWhile(x => true, broken)],
+ /Boom/,
+ "sequence errors propagate");
+
+ assert.deepEqual([...takeWhile(x => false, broken)],
+ [],
+ "hasn't reached error");
+};
+
+exports["test drop"] = assert => {
+ let testDrop = xs => {
+ assert.deepEqual([...drop(2, xs)],
+ [3, 4],
+ "dropped two elements");
+
+ assert.deepEqual([...drop(1, xs)],
+ [2, 3, 4],
+ "dropped one");
+
+ assert.deepEqual([...drop(0, xs)],
+ [1, 2, 3, 4],
+ "dropped 0");
+
+ assert.deepEqual([...drop(-2, xs)],
+ [1, 2, 3, 4],
+ "dropped 0 on negative `n`");
+
+ assert.deepEqual([...drop(5, xs)],
+ [],
+ "dropped all items");
+ };
+
+ testDrop([1, 2, 3, 4]);
+ testDrop(seq(function*() {
+ yield 1;
+ yield 2;
+ yield 3;
+ yield 4;
+ }));
+
+ assert.throws(() => [...drop(1, broken)],
+ /Boom/,
+ "sequence errors propagate");
+};
+
+
+exports["test dropWhile"] = assert => {
+ let isNegative = x => x < 0;
+ let True = _ => true;
+ let False = _ => false;
+
+ let test = xs => {
+ assert.deepEqual([...dropWhile(isNegative, xs)],
+ [0, 1, 2],
+ "dropped negative");
+
+ assert.deepEqual([...dropWhile(True, xs)],
+ [],
+ "drop all");
+
+ assert.deepEqual([...dropWhile(False, xs)],
+ [-2, -1, 0, 1, 2],
+ "keep all");
+ };
+
+ test([-2, -1, 0, 1, 2]);
+ test(seq(function*() {
+ yield -2;
+ yield -1;
+ yield 0;
+ yield 1;
+ yield 2;
+ }));
+
+ assert.throws(() => [...dropWhile(boom, [1, 2, 3])],
+ /Boom/,
+ "function errors errors propagate");
+ assert.throws(() => [...dropWhile(x => true, broken)],
+ /Boom/,
+ "sequence errors propagate");
+};
+
+
+exports["test concat"] = assert => {
+ let test = (a, b, c, d) => {
+ assert.deepEqual([...concat()],
+ [],
+ "nothing to concat");
+ assert.deepEqual([...concat(a)],
+ [1, 2, 3],
+ "concat with nothing returns same as first");
+ assert.deepEqual([...concat(a, b)],
+ [1, 2, 3, 4, 5],
+ "concat items from both");
+ assert.deepEqual([...concat(a, b, a)],
+ [1, 2, 3, 4, 5, 1, 2, 3],
+ "concat itself");
+ assert.deepEqual([...concat(c)],
+ [],
+ "concat of empty is empty");
+ assert.deepEqual([...concat(a, c)],
+ [1, 2, 3],
+ "concat with empty");
+ assert.deepEqual([...concat(c, c, c)],
+ [],
+ "concat of empties is empty");
+ assert.deepEqual([...concat(c, b)],
+ [4, 5],
+ "empty can be in front");
+ assert.deepEqual([...concat(d)],
+ [7],
+ "concat singular");
+ assert.deepEqual([...concat(d, d)],
+ [7, 7],
+ "concat singulars");
+
+ assert.deepEqual([...concat(a, a, b, c, d, c, d, d)],
+ [1, 2, 3, 1, 2, 3, 4, 5, 7, 7, 7],
+ "many concats");
+
+ let ab = concat(a, b);
+ let abcd = concat(ab, concat(c, d));
+ let cdabcd = concat(c, d, abcd);
+
+ assert.deepEqual([...cdabcd],
+ [7, 1, 2, 3, 4, 5, 7],
+ "nested concats");
+ };
+
+ test([1, 2, 3],
+ [4, 5],
+ [],
+ [7]);
+
+ test(seq(function*() { yield 1; yield 2; yield 3; }),
+ seq(function*() { yield 4; yield 5; }),
+ seq(function*() { }),
+ seq(function*() { yield 7; }));
+
+ assert.throws(() => [...concat(broken, [1, 2, 3])],
+ /Boom/,
+ "function errors errors propagate");
+};
+
+
+exports["test first"] = assert => {
+ let test = (xs, empty) => {
+ assert.equal(first(xs), 1, "returns first");
+ assert.equal(first(empty), null, "returns null empty");
+ };
+
+ test("1234", "");
+ test([1, 2, 3], []);
+ test([1, 2, 3], null);
+ test([1, 2, 3], undefined);
+ test(seq(function*() { yield 1; yield 2; yield 3; }),
+ seq(function*() { }));
+ assert.equal(first(broken), 1, "did not reached error");
+};
+
+exports["test rest"] = assert => {
+ let test = (xs, x, nil) => {
+ assert.deepEqual([...rest(xs)], ["b", "c"],
+ "rest items");
+ assert.deepEqual([...rest(x)], [],
+ "empty when singular");
+ assert.deepEqual([...rest(nil)], [],
+ "empty when empty");
+ };
+
+ test("abc", "a", "");
+ test(["a", "b", "c"], ["d"], []);
+ test(seq(function*() { yield "a"; yield "b"; yield "c"; }),
+ seq(function*() { yield "d"; }),
+ seq(function*() {}));
+ test(["a", "b", "c"], ["d"], null);
+ test(["a", "b", "c"], ["d"], undefined);
+
+ assert.throws(() => [...rest(broken)],
+ /Boom/,
+ "sequence errors propagate");
+};
+
+
+exports["test nth"] = assert => {
+ let notFound = {};
+ let test = xs => {
+ assert.equal(nth(xs, 0), "h", "first");
+ assert.equal(nth(xs, 1), "e", "second");
+ assert.equal(nth(xs, 5), void(0), "out of bound");
+ assert.equal(nth(xs, 5, notFound), notFound, "out of bound");
+ assert.equal(nth(xs, -1), void(0), "out of bound");
+ assert.equal(nth(xs, -1, notFound), notFound, "out of bound");
+ assert.equal(nth(xs, 4), "o", "5th");
+ };
+
+ let testEmpty = xs => {
+ assert.equal(nth(xs, 0), void(0), "no first in empty");
+ assert.equal(nth(xs, 5), void(0), "no 5th in empty");
+ assert.equal(nth(xs, 0, notFound), notFound, "notFound on out of bound");
+ };
+
+ test("hello");
+ test(["h", "e", "l", "l", "o"]);
+ test(seq(function*() {
+ yield "h";
+ yield "e";
+ yield "l";
+ yield "l";
+ yield "o";
+ }));
+ testEmpty(null);
+ testEmpty(undefined);
+ testEmpty([]);
+ testEmpty("");
+ testEmpty(seq(function*() {}));
+
+
+ assert.throws(() => nth(broken, 1),
+ /Boom/,
+ "sequence errors propagate");
+ assert.equal(nth(broken, 0), 1, "have not reached error");
+};
+
+
+exports["test last"] = assert => {
+ assert.equal(last(null), null, "no last in null");
+ assert.equal(last(void(0)), null, "no last in undefined");
+ assert.equal(last([]), null, "no last in []");
+ assert.equal(last(""), null, "no last in ''");
+ assert.equal(last(seq(function*() { })), null, "no last in empty");
+
+ assert.equal(last("hello"), "o", "last from string");
+ assert.equal(last([1, 2, 3]), 3, "last from array");
+ assert.equal(last([1]), 1, "last from singular");
+ assert.equal(last(seq(function*() {
+ yield 1;
+ yield 2;
+ yield 3;
+ })), 3, "last from sequence");
+
+ assert.throws(() => last(broken),
+ /Boom/,
+ "sequence errors propagate");
+};
+
+
+exports["test dropLast"] = assert => {
+ let test = xs => {
+ assert.deepEqual([...dropLast(xs)],
+ [1, 2, 3, 4],
+ "dropped last");
+ assert.deepEqual([...dropLast(0, xs)],
+ [1, 2, 3, 4, 5],
+ "dropped none on 0");
+ assert.deepEqual([...dropLast(-3, xs)],
+ [1, 2, 3, 4, 5],
+ "drop none on negative");
+ assert.deepEqual([...dropLast(3, xs)],
+ [1, 2],
+ "dropped given number");
+ assert.deepEqual([...dropLast(5, xs)],
+ [],
+ "dropped all");
+ };
+
+ let testEmpty = xs => {
+ assert.deepEqual([...dropLast(xs)],
+ [],
+ "nothing to drop");
+ assert.deepEqual([...dropLast(0, xs)],
+ [],
+ "dropped none on 0");
+ assert.deepEqual([...dropLast(-3, xs)],
+ [],
+ "drop none on negative");
+ assert.deepEqual([...dropLast(3, xs)],
+ [],
+ "nothing to drop");
+ };
+
+ test([1, 2, 3, 4, 5]);
+ test(seq(function*() {
+ yield 1;
+ yield 2;
+ yield 3;
+ yield 4;
+ yield 5;
+ }));
+ testEmpty([]);
+ testEmpty("");
+ testEmpty(seq(function*() {}));
+
+ assert.throws(() => [...dropLast(broken)],
+ /Boom/,
+ "sequence errors propagate");
+};
+
+
+exports["test distinct"] = assert => {
+ let test = (xs, message) => {
+ assert.deepEqual([...distinct(xs)],
+ [1, 2, 3, 4, 5],
+ message);
+ };
+
+ test([1, 2, 1, 3, 1, 4, 1, 5], "works with arrays");
+ test(seq(function*() {
+ yield 1;
+ yield 2;
+ yield 1;
+ yield 3;
+ yield 1;
+ yield 4;
+ yield 1;
+ yield 5;
+ }), "works with sequences");
+ test(new Set([1, 2, 1, 3, 1, 4, 1, 5]),
+ "works with sets");
+ test(seq(function*() {
+ yield 1;
+ yield 2;
+ yield 2;
+ yield 2;
+ yield 1;
+ yield 3;
+ yield 1;
+ yield 4;
+ yield 4;
+ yield 4;
+ yield 1;
+ yield 5;
+ }), "works with multiple repeatitions");
+ test([1, 2, 3, 4, 5], "work with distinct arrays");
+ test(seq(function*() {
+ yield 1;
+ yield 2;
+ yield 3;
+ yield 4;
+ yield 5;
+ }), "works with distinct seqs");
+};
+
+
+exports["test remove"] = assert => {
+ let isPositive = x => x > 0;
+ let test = xs => {
+ assert.deepEqual([...remove(isPositive, xs)],
+ [-2, -1, 0],
+ "removed positives");
+ };
+
+ test([1, -2, 2, -1, 3, 7, 0]);
+ test(seq(function*() {
+ yield 1;
+ yield -2;
+ yield 2;
+ yield -1;
+ yield 3;
+ yield 7;
+ yield 0;
+ }));
+
+ assert.throws(() => [...distinct(broken)],
+ /Boom/,
+ "sequence errors propagate");
+};
+
+
+exports["test mapcat"] = assert => {
+ let upto = n => seq(function* () {
+ let index = 0;
+ while (index < n) {
+ yield index;
+ index = index + 1;
+ }
+ });
+
+ assert.deepEqual([...mapcat(upto, [1, 2, 3, 4])],
+ [0, 0, 1, 0, 1, 2, 0, 1, 2, 3],
+ "expands given sequence");
+
+ assert.deepEqual([...mapcat(upto, [0, 1, 2, 0])],
+ [0, 0, 1],
+ "expands given sequence");
+
+ assert.deepEqual([...mapcat(upto, [0, 0, 0])],
+ [],
+ "expands given sequence");
+
+ assert.deepEqual([...mapcat(upto, [])],
+ [],
+ "nothing to expand");
+
+ assert.deepEqual([...mapcat(upto, null)],
+ [],
+ "nothing to expand");
+
+ assert.deepEqual([...mapcat(upto, void(0))],
+ [],
+ "nothing to expand");
+
+ let xs = seq(function*() {
+ yield 0;
+ yield 1;
+ yield 0;
+ yield 2;
+ yield 0;
+ });
+
+ assert.deepEqual([...mapcat(upto, xs)],
+ [0, 0, 1],
+ "expands given sequence");
+
+ assert.throws(() => [...mapcat(boom, xs)],
+ /Boom/,
+ "function errors errors propagate");
+ assert.throws(() => [...mapcat(upto, broken)],
+ /Boom/,
+ "sequence errors propagate");
+};
+
+require("sdk/test").run(exports);
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-16 12:45:52 +0000