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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";
+
+const { setTimeout } = require('sdk/timers');
+const utils = require('sdk/lang/functional');
+const { invoke, defer, partial, compose, memoize, once, is, isnt,
+ delay, wrap, curry, chainable, field, query, isInstance, debounce, throttle
+} = utils;
+const { LoaderWithHookedConsole } = require('sdk/test/loader');
+
+exports['test forwardApply'] = function(assert) {
+ function sum(b, c) { return this.a + b + c; }
+ assert.equal(invoke(sum, [2, 3], { a: 1 }), 6,
+ 'passed arguments and pseoude-variable are used');
+
+ assert.equal(invoke(sum.bind({ a: 2 }), [2, 3], { a: 1 }), 7,
+ 'bounded `this` pseoudo variable is used');
+};
+
+exports['test deferred function'] = function(assert, done) {
+ let nextTurn = false;
+ function sum(b, c) {
+ assert.ok(nextTurn, 'enqueued is called in next turn of event loop');
+ assert.equal(this.a + b + c, 6,
+ 'passed arguments an pseoude-variable are used');
+ done();
+ }
+
+ let fixture = { a: 1, method: defer(sum) };
+ fixture.method(2, 3);
+ nextTurn = true;
+};
+
+exports['test partial function'] = function(assert) {
+ function sum(b, c) { return this.a + b + c; }
+
+ let foo = { a : 5 };
+
+ foo.sum7 = partial(sum, 7);
+ foo.sum8and4 = partial(sum, 8, 4);
+
+ assert.equal(foo.sum7(2), 14, 'partial one arguments works');
+
+ assert.equal(foo.sum8and4(), 17, 'partial both arguments works');
+};
+
+exports["test curry defined numeber of arguments"] = function(assert) {
+ var sum = curry(function(a, b, c) {
+ return a + b + c;
+ });
+
+ assert.equal(sum(2, 2, 1), 5, "sum(2, 2, 1) => 5");
+ assert.equal(sum(2, 4)(1), 7, "sum(2, 4)(1) => 7");
+ assert.equal(sum(2)(4, 2), 8, "sum(2)(4, 2) => 8");
+ assert.equal(sum(2)(4)(3), 9, "sum(2)(4)(3) => 9");
+};
+
+exports['test compose'] = function(assert) {
+ let greet = function(name) { return 'hi: ' + name; };
+ let exclaim = function(sentence) { return sentence + '!'; };
+
+ assert.equal(compose(exclaim, greet)('moe'), 'hi: moe!',
+ 'can compose a function that takes another');
+
+ assert.equal(compose(greet, exclaim)('moe'), 'hi: moe!',
+ 'in this case, the functions are also commutative');
+
+ let target = {
+ name: 'Joe',
+ greet: compose(function exclaim(sentence) {
+ return sentence + '!';
+ }, function(title) {
+ return 'hi : ' + title + ' ' + this.name;
+ })
+ };
+
+ assert.equal(target.greet('Mr'), 'hi : Mr Joe!',
+ 'this can be passed in');
+ assert.equal(target.greet.call({ name: 'Alex' }, 'Dr'), 'hi : Dr Alex!',
+ 'this can be applied');
+
+ let single = compose(function(value) {
+ return value + ':suffix';
+ });
+
+ assert.equal(single('text'), 'text:suffix', 'works with single function');
+
+ let identity = compose();
+ assert.equal(identity('bla'), 'bla', 'works with zero functions');
+};
+
+exports['test wrap'] = function(assert) {
+ let greet = function(name) { return 'hi: ' + name; };
+ let backwards = wrap(greet, function(f, name) {
+ return f(name) + ' ' + name.split('').reverse().join('');
+ });
+
+ assert.equal(backwards('moe'), 'hi: moe eom',
+ 'wrapped the saluation function');
+
+ let inner = function () { return 'Hello '; };
+ let target = {
+ name: 'Matteo',
+ hi: wrap(inner, function(f) { return f() + this.name; })
+ };
+
+ assert.equal(target.hi(), 'Hello Matteo', 'works with this');
+
+ function noop() { }
+ let wrapped = wrap(noop, function(f) {
+ return Array.slice(arguments);
+ });
+
+ let actual = wrapped([ 'whats', 'your' ], 'vector', 'victor');
+ assert.deepEqual(actual, [ noop, ['whats', 'your'], 'vector', 'victor' ],
+ 'works with fancy stuff');
+};
+
+exports['test memoize'] = function(assert) {
+ const fib = n => n < 2 ? n : fib(n - 1) + fib(n - 2);
+ let fibnitro = memoize(fib);
+
+ assert.equal(fib(10), 55,
+ 'a memoized version of fibonacci produces identical results');
+ assert.equal(fibnitro(10), 55,
+ 'a memoized version of fibonacci produces identical results');
+
+ function o(key, value) { return value; }
+ let oo = memoize(o), v1 = {}, v2 = {};
+
+
+ assert.equal(oo(1, v1), v1, 'returns value back');
+ assert.equal(oo(1, v2), v1, 'memoized by a first argument');
+ assert.equal(oo(2, v2), v2, 'returns back value if not memoized');
+ assert.equal(oo(2), v2, 'memoized new value');
+ assert.notEqual(oo(1), oo(2), 'values do not override');
+ assert.equal(o(3, v2), oo(2, 3), 'returns same value as un-memoized');
+
+ let get = memoize(function(attribute) { return this[attribute]; });
+ let target = { name: 'Bob', get: get };
+
+ assert.equal(target.get('name'), 'Bob', 'has correct `this`');
+ assert.equal(target.get.call({ name: 'Jack' }, 'name'), 'Bob',
+ 'name is memoized');
+ assert.equal(get('name'), 'Bob', 'once memoized can be called without this');
+};
+
+exports['test delay'] = function(assert, done) {
+ let delayed = false;
+ delay(function() {
+ assert.ok(delayed, 'delayed the function');
+ done();
+ }, 1);
+ delayed = true;
+};
+
+exports['test delay with this'] = function(assert, done) {
+ let context = {};
+ delay.call(context, function(name) {
+ assert.equal(this, context, 'this was passed in');
+ assert.equal(name, 'Tom', 'argument was passed in');
+ done();
+ }, 10, 'Tom');
+};
+
+exports['test once'] = function(assert) {
+ let n = 0;
+ let increment = once(function() { n ++; });
+
+ increment();
+ increment();
+
+ assert.equal(n, 1, 'only incremented once');
+
+ let target = {
+ state: 0,
+ update: once(function() {
+ return this.state ++;
+ })
+ };
+
+ target.update();
+ target.update();
+
+ assert.equal(target.state, 1, 'this was passed in and called only once');
+};
+
+exports['test once with argument'] = function(assert) {
+ let n = 0;
+ let increment = once(a => n++);
+
+ increment();
+ increment('foo');
+
+ assert.equal(n, 1, 'only incremented once');
+
+ increment();
+ increment('foo');
+
+ assert.equal(n, 1, 'only incremented once');
+};
+
+exports['test complement'] = assert => {
+ let { complement } = require("sdk/lang/functional");
+
+ let isOdd = x => Boolean(x % 2);
+
+ assert.equal(isOdd(1), true);
+ assert.equal(isOdd(2), false);
+
+ let isEven = complement(isOdd);
+
+ assert.equal(isEven(1), false);
+ assert.equal(isEven(2), true);
+
+ let foo = {};
+ let isFoo = function() { return this === foo; };
+ let insntFoo = complement(isFoo);
+
+ assert.equal(insntFoo.call(foo), false);
+ assert.equal(insntFoo.call({}), true);
+};
+
+exports['test constant'] = assert => {
+ let { constant } = require("sdk/lang/functional");
+
+ let one = constant(1);
+
+ assert.equal(one(1), 1);
+ assert.equal(one(2), 1);
+};
+
+exports['test apply'] = assert => {
+ let { apply } = require("sdk/lang/functional");
+
+ let dashify = (...args) => args.join("-");
+
+ assert.equal(apply(dashify, 1, [2, 3]), "1-2-3");
+ assert.equal(apply(dashify, "a"), "a");
+ assert.equal(apply(dashify, ["a", "b"]), "a-b");
+ assert.equal(apply(dashify, ["a", "b"], "c"), "a,b-c");
+ assert.equal(apply(dashify, [1, 2], [3, 4]), "1,2-3-4");
+};
+
+exports['test flip'] = assert => {
+ let { flip } = require("sdk/lang/functional");
+
+ let append = (left, right) => left + " " + right;
+ let prepend = flip(append);
+
+ assert.equal(append("hello", "world"), "hello world");
+ assert.equal(prepend("hello", "world"), "world hello");
+
+ let wrap = function(left, right) {
+ return left + " " + this + " " + right;
+ };
+ let invertWrap = flip(wrap);
+
+ assert.equal(wrap.call("@", "hello", "world"), "hello @ world");
+ assert.equal(invertWrap.call("@", "hello", "world"), "world @ hello");
+
+ let reverse = flip((...args) => args);
+
+ assert.deepEqual(reverse(1, 2, 3, 4), [4, 3, 2, 1]);
+ assert.deepEqual(reverse(1), [1]);
+ assert.deepEqual(reverse(), []);
+
+ // currying still works
+ let prependr = curry(prepend);
+
+ assert.equal(prependr("hello", "world"), "world hello");
+ assert.equal(prependr("hello")("world"), "world hello");
+};
+
+exports["test when"] = assert => {
+ let { when } = require("sdk/lang/functional");
+
+ let areNums = (...xs) => xs.every(x => typeof(x) === "number");
+
+ let sum = when(areNums, (...xs) => xs.reduce((y, x) => x + y, 0));
+
+ assert.equal(sum(1, 2, 3), 6);
+ assert.equal(sum(1, 2, "3"), undefined);
+
+ let multiply = when(areNums,
+ (...xs) => xs.reduce((y, x) => x * y, 1),
+ (...xs) => xs);
+
+ assert.equal(multiply(2), 2);
+ assert.equal(multiply(2, 3), 6);
+ assert.deepEqual(multiply(2, "4"), [2, "4"]);
+
+ function Point(x, y) {
+ this.x = x;
+ this.y = y;
+ }
+
+ let isPoint = x => x instanceof Point;
+
+ let inc = when(isPoint, ({x, y}) => new Point(x + 1, y + 1));
+
+ assert.equal(inc({}), undefined);
+ assert.deepEqual(inc(new Point(0, 0)), { x: 1, y: 1 });
+
+ let axis = when(isPoint,
+ ({ x, y }) => [x, y],
+ _ => [0, 0]);
+
+ assert.deepEqual(axis(new Point(1, 4)), [1, 4]);
+ assert.deepEqual(axis({ foo: "bar" }), [0, 0]);
+};
+
+exports["test chainable"] = function(assert) {
+ let Player = function () { this.volume = 5; };
+ Player.prototype = {
+ setBand: chainable(function (band) { return (this.band = band); }),
+ incVolume: chainable(function () { return this.volume++; })
+ };
+ let player = new Player();
+ player
+ .setBand('Animals As Leaders')
+ .incVolume().incVolume().incVolume().incVolume().incVolume().incVolume();
+
+ assert.equal(player.band, 'Animals As Leaders', 'passes arguments into chained');
+ assert.equal(player.volume, 11, 'accepts no arguments in chain');
+};
+
+exports["test field"] = assert => {
+ let Num = field("constructor", 0);
+ assert.equal(Num.name, Number.name);
+ assert.ok(typeof(Num), "function");
+
+ let x = field("x");
+
+ [
+ [field("foo", { foo: 1 }), 1],
+ [field("foo")({ foo: 1 }), 1],
+ [field("bar", {}), undefined],
+ [field("bar")({}), undefined],
+ [field("hey", undefined), undefined],
+ [field("hey")(undefined), undefined],
+ [field("how", null), null],
+ [field("how")(null), null],
+ [x(1), undefined],
+ [x(undefined), undefined],
+ [x(null), null],
+ [x({ x: 1 }), 1],
+ [x({ x: 2 }), 2],
+ ].forEach(([actual, expected]) => assert.equal(actual, expected));
+};
+
+exports["test query"] = assert => {
+ let Num = query("constructor", 0);
+ assert.equal(Num.name, Number.name);
+ assert.ok(typeof(Num), "function");
+
+ let x = query("x");
+ let xy = query("x.y");
+
+ [
+ [query("foo", { foo: 1 }), 1],
+ [query("foo")({ foo: 1 }), 1],
+ [query("foo.bar", { foo: { bar: 2 } }), 2],
+ [query("foo.bar")({ foo: { bar: 2 } }), 2],
+ [query("foo.bar", { foo: 1 }), undefined],
+ [query("foo.bar")({ foo: 1 }), undefined],
+ [x(1), undefined],
+ [x(undefined), undefined],
+ [x(null), null],
+ [x({ x: 1 }), 1],
+ [x({ x: 2 }), 2],
+ [xy(1), undefined],
+ [xy(undefined), undefined],
+ [xy(null), null],
+ [xy({ x: 1 }), undefined],
+ [xy({ x: 2 }), undefined],
+ [xy({ x: { y: 1 } }), 1],
+ [xy({ x: { y: 2 } }), 2]
+ ].forEach(([actual, expected]) => assert.equal(actual, expected));
+};
+
+exports["test isInstance"] = assert => {
+ function X() {}
+ function Y() {}
+ let isX = isInstance(X);
+
+ [
+ isInstance(X, new X()),
+ isInstance(X)(new X()),
+ !isInstance(X, new Y()),
+ !isInstance(X)(new Y()),
+ isX(new X()),
+ !isX(new Y())
+ ].forEach(x => assert.ok(x));
+};
+
+exports["test is"] = assert => {
+
+ assert.deepEqual([ 1, 0, 1, 0, 1 ].map(is(1)),
+ [ true, false, true, false, true ],
+ "is can be partially applied");
+
+ assert.ok(is(1, 1));
+ assert.ok(!is({}, {}));
+ assert.ok(is()(1)()(1), "is is curried");
+ assert.ok(!is()(1)()(2));
+};
+
+exports["test isnt"] = assert => {
+
+ assert.deepEqual([ 1, 0, 1, 0, 1 ].map(isnt(0)),
+ [ true, false, true, false, true ],
+ "is can be partially applied");
+
+ assert.ok(!isnt(1, 1));
+ assert.ok(isnt({}, {}));
+ assert.ok(!isnt()(1)()(1));
+ assert.ok(isnt()(1)()(2));
+};
+
+exports["test debounce"] = (assert, done) => {
+ let counter = 0;
+ let fn = debounce(() => counter++, 100);
+
+ new Array(10).join(0).split("").forEach(fn);
+
+ assert.equal(counter, 0, "debounce does not fire immediately");
+ setTimeout(() => {
+ assert.equal(counter, 1, "function called after wait time");
+ fn();
+ setTimeout(() => {
+ assert.equal(counter, 2, "function able to be called again after wait");
+ done();
+ }, 150);
+ }, 200);
+};
+
+exports["test throttle"] = (assert, done) => {
+ let called = 0;
+ let attempt = 0;
+ let atleast100ms = false;
+ let throttledFn = throttle(() => {
+ called++;
+ if (called === 2) {
+ assert.equal(attempt, 10, "called twice, but attempted 10 times");
+ fn();
+ }
+ if (called === 3) {
+ assert.ok(atleast100ms, "atleast 100ms have passed");
+ assert.equal(attempt, 11, "called third, waits for delay to happen");
+ done();
+ }
+ }, 200);
+ let fn = () => ++attempt && throttledFn();
+
+ setTimeout(() => atleast100ms = true, 100);
+
+ new Array(11).join(0).split("").forEach(fn);
+};
+
+require('sdk/test').run(exports);
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