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author | Matt A. Tobin <email@mattatobin.com> | 2018-02-09 06:46:43 -0500 |
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committer | Matt A. Tobin <email@mattatobin.com> | 2018-02-09 06:46:43 -0500 |
commit | ac46df8daea09899ce30dc8fd70986e258c746bf (patch) | |
tree | 2750d3125fc253fd5b0671e4bd268eff1fd97296 /addon-sdk/source/lib/method/Readme.md | |
parent | 8cecf8d5208f3945b35f879bba3015bb1a11bec6 (diff) | |
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Move Add-on SDK source to toolkit/jetpack
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-rw-r--r-- | addon-sdk/source/lib/method/Readme.md | 117 |
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diff --git a/addon-sdk/source/lib/method/Readme.md b/addon-sdk/source/lib/method/Readme.md deleted file mode 100644 index 9584c9160..000000000 --- a/addon-sdk/source/lib/method/Readme.md +++ /dev/null @@ -1,117 +0,0 @@ -# method - -[](http://travis-ci.org/Gozala/method) - -Library provides an API for defining polymorphic methods that dispatch on the -first argument type. This provides a powerful way for decouple abstraction -interface definition from an actual implementation per type, without risks -of interference with other libraries. - -### Motivation - - - Provide a high-performance, dynamic polymorphism construct as an - alternative to existing object methods that does not provides any - mechanics for guarding against name conflicts. - - Allow independent extension of types, and implementations of methods - on types, by different parties. - -## Install - - npm install method - -## Use - -```js -var method = require("method") - -// Define `isWatchable` method that can be implemented for any type. -var isWatchable = method("isWatchable") - -// If you call it on any object it will -// throw as nothing implements that method yet. -//isWatchable({}) // => Exception: method is not implemented - -// If you define private method on `Object.prototype` -// all objects will inherit it. -Object.prototype[isWatchable] = function() { - return false; -} - -isWatchable({}) // => false - - -// Although `isWatchable` property above will be enumerable and there for -// may damage some assumbtions made by other libraries. There for it"s -// recomended to use built-in helpers methods that will define extension -// without breaking assumbtions made by other libraries: - -isWatchable.define(Object, function() { return false }) - - -// There are primitive types in JS that won"t inherit methods from Object: -isWatchable(null) // => Exception: method is not implemented - -// One could either implement methods for such types: -isWatchable.define(null, function() { return false }) -isWatchable.define(undefined, function() { return false }) - -// Or simply define default implementation: -isWatchable.define(function() { return false }) - -// Alternatively default implementation may be provided at creation: -isWatchable = method(function() { return false }) - -// Method dispatches on an first argument type. That allows us to create -// new types with an alternative implementations: -function Watchable() {} -isWatchable.define(Watchable, function() { return true }) - -// This will make all `Watchable` instances watchable! -isWatchable(new Watchable()) // => true - -// Arbitrary objects can also be extended to implement given method. For example -// any object can simply made watchable: -function watchable(object) { - return isWatchable.implement(objct, function() { return true }) -} - -isWatchable(watchable({})) // => true - -// Full protocols can be defined with such methods: -var observers = "observers@" + module.filename -var watchers = method("watchers") -var watch = method("watch") -var unwatch = method("unwatch") - -watchers.define(Watchable, function(target) { - return target[observers] || (target[observers] = []) -}) - -watch.define(Watchable, function(target, watcher) { - var observers = watchers(target) - if (observers.indexOf(watcher) < 0) observers.push(watcher) - return target -}) -unwatch.define(Watchable, function(target, watcher) { - var observers = watchers(target) - var index = observers.indexOf(watcher) - if (observers.indexOf(watcher) >= 0) observers.unshift(watcher) - return target -}) - -// Define type Port that inherits form Watchable - -function Port() {} -Port.prototype = Object.create(Watchable.prototype) - -var emit = method("emit") -emit.define(Port, function(port, message) { - watchers(port).slice().forEach(function(watcher) { - watcher(message) - }) -}) - -var p = new Port() -watch(p, console.log) -emit(p, "hello world") // => info: "hello world" -``` |