JarCasting
es6-symbol
ECMAScript 6 Symbol polyfill
For more information about symbols see following links
Limitations
Underneath it uses real string property names which can easily be retrieved, however accidental collision with other property names is unlikely.
Usage
If you'd like to use native version when it exists and fallback to ponyfill if it doesn't, use es6-symbol as following:
var Symbol = require("es6-symbol");
If you want to make sure your environment implements Symbol globally, do:
require("es6-symbol/implement");
If you strictly want to use polyfill even if native Symbol exists (hard to find a good reason for that), do:
var Symbol = require("es6-symbol/polyfill");
API
Best is to refer to specification. Still if you want quick look, follow examples:
var Symbol = require("es6-symbol");
var symbol = Symbol("My custom symbol");
var x = {};
x[symbol] = "foo";
console.log(x[symbol]);
("foo");
// Detect iterable:
var iterator, result;
if (possiblyIterable[Symbol.iterator]) {
iterator = possiblyIterable[Symbol.iterator]();
result = iterator.next();
while (!result.done) {
console.log(result.value);
result = iterator.next();
}
}
Installation
NPM
In your project path:
$ npm install es6-symbol
Browser
To port it to Browser or any other (non CJS) environment, use your favorite CJS bundler. No favorite yet? Try: Browserify, Webmake or Webpack
Tests
$ npm test
Security contact information
To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure.
Tidelift helps make open source sustainable for maintainers while giving companies
assurances about security, maintenance, and licensing for their dependencies.