define-properties-x

define-properties-x

Based on the original work by Jordan Harband define-properties.

ECMAScript compatibility shims for legacy JavaScript engines

`es5-shim.js` monkey-patches a JavaScript context to contain all EcmaScript 5 methods that can be faithfully emulated with a legacy JavaScript engine.

es5-sham.js monkey-patches other ES5 methods as closely as possible. For these methods, as closely as possible to ES5 is not very close. Many of these shams are intended only to allow code to be written to ES5 without causing run-time errors in older engines. In many cases, this means that these shams cause many ES5 methods to silently fail. Decide carefully whether this is what you want. Note: es5-sham.js requires es5-shim.js to be able to work properly.

json3.js monkey-patches the EcmaScript 5 JSON implimentation faithfully.

es6.shim.js provides compatibility shims so that legacy JavaScript engines behave as closely as possible to ECMAScript 6 (Harmony).

Version: 1.0.1
Author: Xotic750 [e-mail]
License: MIT
Copyright: Xotic750

• define-properties-x
  • ~supportsDescriptors : boolean
  • ~defineProperty(object, property, value, [force])
  • ~defineProperties(object, map, [predicates])

define-properties-x~supportsDescriptors : boolean

Boolean indicator as to whether the environments supports descriptors or not.

Kind: inner property of define-properties-x
Example

var lib = require('define-properties-x');
lib.supportsDescriptors; // true or false

define-properties-x~defineProperty(object, property, value, [force])

Just like defineProperties but for defining a single non-enumerable property. Useful in environments that do not support Computed property names. This can be done with defineProperties, but this method can read a little cleaner.

Kind: inner method of define-properties-x

Param	Type	Default	Description
object	Object		The object on which to define the property.
property	string | Symbol		The property name.
value	*		The value of the property.
[force]	boolean	false	If true then set property regardless.

Example

var lib = require('define-properties-x');
var myString = 'something';
lib.defineProperty(obj, Symbol.iterator, function () {}, true);
lib.defineProperty(obj, myString, function () {}, true);

define-properties-x~defineProperties(object, map, [predicates])

Define multiple non-enumerable properties at once. Uses Object.defineProperty when available; falls back to standard assignment in older engines. Existing properties are not overridden. Accepts a map of property names to a predicate that, when true, force-overrides.

Kind: inner method of define-properties-x

Param	Type	Description
object	Object	The object on which to define the property.
map	Object	The object of properties.
[predicates]	Object	The object of property predicates.

Example

var lib = require('define-properties-x');
lib.defineProperties({
  a: 1,
  b: 2
}, {
  a: function () { return false; },
  b: function () { return true; }
});