Comparison of JavaScript engines

Short description: Wikimedia list article

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The following tables compare standards support for some notable JavaScript/ECMAScript engines used in web browsers.

## Contents

* 1 Explanation of tables
* 1.1 Values
* 2 ECMAScript version support
* 3 Standard library
* 3.1 Global object
* 3.2 Object object
* 3.3 Function object
* 3.4 Array object
* 3.5 String object
* 3.6 Boolean object
* 3.7 Number object
* 3.8 Math object
* 3.9 Date object
* 3.10 RegExp object
* 3.11 Error object
* 3.12 NativeError objects
* 4 References
* 5 Further reading
* 6 External links

## Explanation of tables

See List of ECMAScript engines for a full list.

### Values

These indicate the level of support for the given item in each engine. By default, the most recent version of the engine is implied. However, a specific version number can be listed; when this indicates full support, it's the initial version of the engine fully supporting the item.

Value  | Meaning

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Yes  | Fully supported
No  | Has never been supported
Partial  | Only some values are supported
Incorrect  | Not implemented correctly in all cases
Experimental  | May be incomplete or buggy
Nightly build | Currently in development; full support is expected
Depends  | Only supported for the specified conditions
Dropped  | No longer supported

## ECMAScript version support

Overview of ECMAScript version support  Browser engine | MSHTML  | Gecko | WebKit | Presto  | Blink

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Corresponding JavaScript engine  | JScript / Chakra | SpiderMonkey  | JavaScriptCore | Linear B / Futhark / Carakan  | V8
ECMAScript Edition 3  | Yes  | 0.6  | Yes  | 1.0  | Yes
ECMAScript Edition 5  | 5.0  | 2.0  | Partial  | Yes  | Yes
ECMAScript Edition 6  | ?  | ?  | ?  | ?  | ?
JavaScript 1.5 extensions  | No  | 0.6  | Yes  | 1.0  | Yes
JavaScript 1.6 extensions
(excluding E4X)  | No  | 1.8  | Partial  | Partial  | Partial
JavaScript 1.7 extensions  | No  | 1.8.1  | No  | Partial  | No
JavaScript 1.8 extensions  | No  | 1.9  | Partial  | No  | Partial
JavaScript 1.8.1 extensions  | No  | 1.9.1  | No  | No  | No
JScript .NET extensions  | No  | No  | No  | No  | No
ActionScript extensions  | No  | No  | No  | No  | No
E4X  | No  | Dropped[1] | No  | No  | No

## Standard library

### Global object

Implementation of global objects  Global object  | MSHTML  | Gecko | WebKit | Presto  | Blink

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Value properties
`NaN` | 4.0  | 0.6  | Yes  | Yes  | Yes
`Infinity` | 4.0  | 0.6  | Yes  | Yes  | Yes
`undefined` | 5.5  | 0.6  | Yes  | Yes  | Yes
Function properties
`eval(x)` | 3.0  | 0.6  | Yes  | Yes  | Yes
`parseInt(string [, radix])` | 3.0  | 0.6  | Yes  | Yes  | Yes
`parseFloat(string)` | 3.0  | 0.6  | Yes  | Yes  | Yes
`isNaN(number)` | 4.0  | 0.6  | Yes  | Yes  | Yes
`isFinite(number)` | 4.0  | 0.6  | Yes  | Yes  | Yes
URI handling functions
`decodeURI(encodedURI)` | 5.5  | 0.6  | Yes  | Yes  | Yes
`decodeURIComponent(encodedURIComponent)` | 5.5  | 0.6  | Yes  | Yes  | Yes
`encodeURI(uri)` | 5.5  | 0.6  | Yes  | Yes  | Yes
`encodeURIComponent(uriComponent)` | 5.5  | 0.6  | Yes  | Yes  | Yes
Constructor properties
`Object` | 4.0  | Yes  | Yes  | Yes  | Yes
`Function` | 4.0  | Yes  | Yes  | Yes  | Yes
`Array` | 4.0  | Yes  | Yes  | Yes  | Yes
`String` | 3.0  | Yes  | Yes  | Yes  | Yes
`Boolean` | 3.0  | Yes  | Yes  | Yes  | Yes
`Number` | 3.0  | Yes  | Yes  | Yes  | Yes
`Date` | 3.0  | Yes  | Yes  | Yes  | Yes
`RegExp` | 4.0  | Yes  | Yes  | Yes  | Yes
`Error` | 5.0  | Yes  | Yes  | Yes  | Yes
`EvalError` | 5.0  | Yes  | Yes  | Yes  | Yes
`RangeError` | 5.0  | Yes  | Yes  | Yes  | Yes
`ReferenceError` | 5.0  | Yes  | Yes  | Yes  | Yes
`SyntaxError` | 5.0  | Yes  | Yes  | Yes  | Yes
`TypeError` | 5.0  | Yes  | Yes  | Yes  | Yes
`URIError` | 5.0  | Yes  | Yes  | Yes  | Yes
Other properties
`Math` | 3.0  | Yes  | Yes  | Yes  | Yes
Additional properties
`escape(string)` | 3.0  | Yes  | Yes  | Yes  | Yes
`unescape(string)` | 3.0  | Yes  | Yes  | Yes  | Yes

### Object object

Implementation of object objects  Object object  | MSHTML  | Gecko | WebKit | Presto  | Blink

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Called as function
`Object([value])` | Yes  | Yes  | Yes  | Yes  | Yes
Called as constructor
`new Object([value])` | 4.0  | Yes  | Yes  | Yes  | Yes
Properties
`prototype` | 4.0  | Yes  | Yes  | Yes  | Yes
Properties of prototype
`constructor` | 4.0  | Yes  | Yes  | Yes  | Yes
`toString()` | 4.0  | Yes  | Yes  | Yes  | Yes
`toLocaleString()` | 4.0  | Yes  | Yes  | Yes  | Yes
`valueOf()` | 4.0  | Yes  | Yes  | Yes  | Yes
`hasOwnProperty(V)` | 5.5  | Yes  | 3  | Yes  | Yes
`isPrototypeOf(V)` | 5.5  | Yes  | 3  | Yes  | Yes
`propertyIsEnumerable(V)` | 5.5  | Yes  | 3  | Yes  | Yes

### Function object

Implementation of function objects  Function object  | MSHTML  | Gecko | WebKit | Presto  | Blink

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Called as function
`Function(p1 [, p2 [, ...,] body])` | ?  | Yes  | Yes  | ?  | Yes
Called as constructor
`new Function(p1 [, p2 [, ...,] body])` | 4.0  | 1.0  | Yes  | 1.0  | Yes
Properties
`length` | ?  | 1.0  | Yes  | Yes  | Yes
`prototype` | 4.0  | 1.0  | Yes  | 1.0  | Yes
Properties of prototype
`length` | ?  | 1.0  | Yes  | ?  | Yes
`constructor` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`toString()` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`apply(thisArg, argArray)` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`call(thisArg [, arg1 [, arg2 [, ...]]])` | 4.0  | 1.0  | Yes  | 1.0  | Yes
Properties of instances
`length` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`prototype` | 4.0  | 1.0  | Yes  | 1.0  | Yes

### Array object

Implementation of array objects  Array object  | MSHTML  | Gecko | WebKit | Presto  | Blink

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Called as function
`Array([item1 [, item2 [, ...]]])` | Yes  | Yes  | Yes  | Yes  | Yes
Called as constructor
`new Array([item1, item2 [, ...]])` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`new Array(len)` | 4.0  | 1.0  | Yes  | 1.0  | Yes
Properties
`prototype` | 4.0  | 1.0  | Yes  | 1.0  | Yes
Properties of prototype
`constructor` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`toString()` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`toLocaleString()` | 5.5  | 1.0  | Yes  | 1.0  | Yes
`concat([item1 [, item2 [,...]]])` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`join(separator)` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`pop()` | 5.5  | 1.0  | Yes  | 1.0  | Yes
`push([item1 [, item2 [,...]]])` | 5.5  | 1.0  | Yes  | 1.0  | Yes
`reverse()` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`shift()` | 5.5  | 1.0  | Yes  | 1.0  | Yes
`slice(start, end)` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`sort(comparefn)` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`splice(start, deleteCount [, item1 [, item2 [, ...]]])` | 5.5  | 1.0  | Yes  | 1.0  | Yes
`unshift([item1 [, item2 [, ...]]])` | 5.5  | 1.0  | Yes  | 1.0  | Yes
`indexOf(searchElement[, fromIndex])` | 9.0[2] | 1.8  | 522  | 2.1  | Yes
`lastIndexOf(searchElement[, fromIndex])` | 1.8  | 522  | 2.1  | Yes
`filter(callback[, thisObject])` | 1.8  | 522  | 2.1  | Yes
`forEach(callback[, thisObject])` | 1.8  | 522  | 2.1  | Yes
`every(callback[, thisObject])` | 1.8  | 522  | 2.1  | Yes
`map(callback[, thisObject])` | 1.8  | 522  | 2.1  | Yes
`some(callback[, thisObject])` | 1.8  | 522  | 2.1  | Yes
`reduce(callback[, initialValue])` | 1.9  | 528  | 2.5.22  | Yes
`reduceRight(callback[, initialValue])` | 1.9  | 528  | 2.5.22  | Yes
Properties of instances
`length` | 4.0  | 1.0  | Yes  | 1.0  | Yes

### String object

Implementation of string objects  String object  | MSHTML  | Gecko | WebKit | Presto  | Blink

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Called as function
`String([value])` | Yes  | Yes  | Yes  | Yes  | Yes
Called as constructor
`new String([value])` | 3.0  | 1.0  | Yes  | 1.0  | Yes
Properties
`prototype` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`fromCharCode([char0 [, char1 [, ...]]])` | 4.0  | 1.0  | Yes  | 1.0  | Yes
Properties of prototype
`constructor` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`toString()` | 3.0  | 1.0  | Yes  | 1.0  | Yes
`valueOf()` | 3.0  | 1.0  | Yes  | 1.0  | Yes
`charAt(pos)` | 3.0  | 1.0  | Yes  | 1.0  | Yes
`charCodeAt(pos)` | 5.5  | 1.0  | Yes  | 1.0  | Yes
`concat([string1 [, string2 [, ...]]])` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`indexOf(searchString, position)` | 3.0  | 1.0  | Yes  | 1.0  | Yes
`lastIndexOf(searchString, position)` | 3.0  | 1.0  | Yes  | 1.0  | Yes
`localeCompare(that)` | 5.5  | 1.0  | Yes  | 1.0  | Yes
`match(regexp)` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`replace(searchValue, replaceValue)` | 3.0  | 1.0  | Yes  | 1.0  | Yes
`search(regexp)` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`slice(start, end)` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`split(separator, limit)` | 4.0  | 1.0  | Yes  | 1.0  | Yes
`substring(start, end)` | 3.0  | 1.0  | Yes  | 1.0  | Yes
`toLowerCase()` | 3.0  | 1.0  | Yes  | 1.0  | Yes
`toLocaleLowerCase(comparefn)` | 3.0  | 1.0  | Yes  | 1.0  | Yes
`toUpperCase()` | 3.0  | 1.0  | Yes  | 1.0  | Yes
`toLocaleUpperCase()` | 3.0  | 1.0  | Yes  | 1.0  | Yes
Additional properties of prototype
`substr(start, length)` | 4.0  | 1.0  | Yes  | 1.0  | Yes
Properties of instances
`length` | 3.0  | 1.0  | Yes  | 1.0  | Yes

### Boolean object

Implementation of Boolean objects  Boolean object  | MSHTML  | Gecko | WebKit | Presto  | Blink

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Called as function
`Boolean([value])` | Yes  | Yes  | Yes  | Yes  | Yes
Called as constructor
`new Boolean([value])` | 3.0  | Yes  | Yes  | Yes  | Yes
Properties
`prototype` | 4.0  | Yes  | Yes  | Yes  | Yes
Properties of prototype
`constructor` | 4.0  | Yes  | Yes  | Yes  | Yes
`toString()` | 4.0  | Yes  | Yes  | Yes  | Yes
`valueOf()` | 4.0  | Yes  | Yes  | Yes  | Yes

### Number object

Implementation of number objects  Number object  | MSHTML  | Gecko | WebKit | Presto

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Called as function
`Number([value])` | ?  | Yes  | Yes  | ?
Called as constructor
`new Number([value])` | 3.0  | 1.0  | Yes  | 1.0
Properties
`prototype` | 4.0  | 1.0  | Yes  | 1.0
`MAX_VALUE` | 4.0  | 1.0  | Yes  | 1.0
`MIN_VALUE` | 4.0  | 1.0  | Yes  | 1.0
`NaN` | 4.0  | 1.0  | Yes  | 1.0
`NEGATIVE_INFINITY` | 4.0  | 1.0  | Yes  | 1.0
`POSITIVE_INFINITY` | 4.0  | 1.0  | Yes  | 1.0
Properties of prototype
`constructor` | 4.0  | 1.0  | Yes  | 1.0
`toString([radix])` | 4.0  | 1.0  | Yes  | 1.0
`toLocaleString()` | 5.5  | 1.0  | Yes  | 1.0
`valueOf()` | 4.0  | 1.0  | Yes  | 1.0
`toFixed(fractionDigits)` | 5.5  | 1.0  | Yes  | 1.0
`toExponential(fractionDigits)` | 5.5  | 1.0  | Yes  | 1.0
`toPrecision(precision)` | 5.5  | 1.0  | Yes  | 1.0

### Math object

Implementation of math objects  Math object  | MSHTML  | Gecko | WebKit | Presto

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Value properties
`E` | 3.0  | 1.0  | Yes  | 1.0
`LN10` | 3.0  | 1.0  | Yes  | 1.0
`LN2` | 3.0  | 1.0  | Yes  | 1.0
`LOG2E` | 3.0  | 1.0  | Yes  | 1.0
`LOG10E` | 3.0  | 1.0  | Yes  | 1.0
`PI` | Yes  | Yes  | Yes  | Yes
`SQRT1_2` | 3.0  | 1.0  | Yes  | 1.0
`SQRT2` | Yes  | Yes  | Yes  | Yes
Function properties
`abs(x)` | 3.0  | 1.0  | Yes  | 1.0
`acos(x)` | 3.0  | 1.0  | Yes  | 1.0
`asin(x)` | 3.0  | 1.0  | Yes  | 1.0
`atan(x)` | 3.0  | 1.0  | Yes  | 1.0
`atan2(y, x)` | 3.0  | 1.0  | Yes  | 1.0
`ceil(x)` | 3.0  | 1.0  | Yes  | 1.0
`cos(x)` | 3.0  | 1.0  | Yes  | 1.0
`exp(x)` | 3.0  | 1.0  | Yes  | 1.0
`floor(x)` | 3.0  | 1.0  | Yes  | 1.0
`log(x)` | 3.0  | 1.0  | Yes  | 1.0
`max([value1 [, value2 [, ...]]])` | 3.0  | 1.0  | Yes  | 1.0
`min([value1 [, value2 [, ...]]])` | 3.0  | 1.0  | Yes  | 1.0
`pow(x, y)` | 3.0  | 1.0  | Yes  | 1.0
`random()` | 3.0  | 1.0  | Yes  | 1.0
`round(x)` | 3.0  | 1.0  | Yes  | 1.0
`sin(x)` | 3.0  | 1.0  | Yes  | 1.0
`sqrt(x)` | 3.0  | 1.0  | Yes  | 1.0
`tan(x)` | 3.0  | 1.0  | Yes  | 1.0

### Date object

Implementation of date objects  Date object  | MSHTML  | Gecko | WebKit | Presto

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Called as function
`Date ([year [, month [, date [, hours [, minutes [, seconds [, ms ]]]]]]])` | ?  | ?  | ?  | ?
Called as constructor
`new Date (year, month [, date [, hours [, minutes [, seconds [, ms ]]]]])` | 4.0  | 1.0  | Yes  | 1.0
`new Date (value)` | 4.0  | 1.0  | Yes  | 1.0
`new Date ()` | 4.0  | 1.0  | Yes  | 1.0
Properties
`prototype` | 4.0  | 1.0  | Yes  | 1.0
`parse(string)` | 3.0  | 1.0  | Yes  | 1.0
`UTC (year, month [, date [, hours [, minutes [, seconds [, ms ]]]]])` | 3.0  | 1.0  | Yes  | 1.0
Properties of prototype
`constructor` | 4.0  | 1.0  | Yes  | 1.0
`toString()` | 4.0  | 1.0  | Yes  | 1.0
`toDateString()` | 4.0  | 1.0  | Yes  | 1.0
`toTimeString()` | 4.0  | 1.0  | Yes  | 1.0
`toLocaleString()` | 4.0  | 1.0  | Yes  | 1.0
`toLocaleDateString()` | 4.0  | 1.0  | Yes  | 1.0
`toLocaleTimeString()` | 4.0  | 1.0  | Yes  | 1.0
`valueOf()` | 4.0  | 1.0  | Yes  | 1.0
`getTime()` | 3.0  | 1.0  | Yes  | 1.0
`getFullYear()` | 4.0  | 1.0  | Yes  | 1.0
`getMonth()` | 3.0  | 1.0  | Yes  | 1.0
`getUTCMonth()` | 4.0  | 1.0  | Yes  | 1.0
`getDate()` | 3.0  | 1.0  | Yes  | 1.0
`getUTCDate()` | 4.0  | 1.0  | Yes  | 1.0
`getDay()` | 3.0  | 1.0  | Yes  | 1.0
`getUTCDay()` | 4.0  | 1.0  | Yes  | 1.0
`getHours()` | 3.0  | 1.0  | Yes  | 1.0
`getUTCHours()` | 4.0  | 1.0  | Yes  | 1.0
`getMinutes()` | 3.0  | 1.0  | Yes  | 1.0
`getUTCMinutes()` | 4.0  | 1.0  | Yes  | 1.0
`getSeconds()` | 3.0  | 1.0  | Yes  | 1.0
`getUTCSeconds()` | 4.0  | 1.0  | Yes  | 1.0
`getMilliseconds()` | 4.0  | 1.0  | Yes  | 1.0
`getUTCMilliseconds()` | 4.0  | 1.0  | Yes  | 1.0
`getTimezoneOffset()` | 4.0  | 1.0  | Yes  | 1.0
`setTime(time)` | 3.0  | 1.0  | Yes  | 1.0
`setMilliseconds(ms)` | 4.0  | 1.0  | Yes  | 1.0
`setUTCMilliseconds(ms)` | 4.0  | 1.0  | Yes  | 1.0
`setSeconds(sec [, ms])` | 3.0  | 1.0  | Yes  | 1.0
`setUTCSeconds(sec [, ms])` | 4.0  | 1.0  | Yes  | 1.0
`setMinutes(min [, sec [, ms]])` | 3.0  | 1.0  | Yes  | 1.0
`setUTCMinutes(min [, sec [, ms]])` | 4.0  | 1.0  | Yes  | 1.0
`setHours(hour [, min [, sec [, ms]]])` | 4.0  | 1.0  | Yes  | 1.0
`setUTCHours(hour [, min [, sec [, ms]]])` | 4.0  | 1.0  | Yes  | 1.0
`setDate(date)` | 4.0  | 1.0  | Yes  | 1.0
`setUTCDate(date)` | 4.0  | 1.0  | Yes  | 1.0
`setMonth(month [, date])` | 3.0  | 1.0  | Yes  | 1.0
`setUTCMonth(month [, date])` | 4.0  | 1.0  | Yes  | 1.0
`setFullYear(year [, month [, date]])` | 4.0  | 1.0  | Yes  | 1.0
`setUTCFullYear(year [, month [, date]])` | 4.0  | 1.0  | Yes  | 1.0
`toUTCString()` | 4.0  | 1.0  | Yes  | 1.0
Additional properties of prototype
`getYear()` | 3.0  | 1.0  | Yes  | 1.0
`setYear(year)` | 3.0  | 1.0  | Yes  | 1.0
`toGMTString()` | 4.0  | 1.0  | Yes  | 1.0

### RegExp object

Implementation of RegExp objects  RegExp object  | MSHTML  | Gecko | WebKit | Presto

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Called as function
`RegExp (pattern, flags)` | ?  | ?  | ?  | ?
Called as constructor
`new RegExp (pattern, flags)` | 4.0  | 1.0  | Yes  | 1.0
Properties
`prototype` | 4.0  | 1.0  | Yes  | 1.0
Properties of prototype
`constructor` | 4.0  | 1.0  | Yes  | 1.0
`exec(string)` | 4.0  | 1.0  | Yes  | 1.0
`test(string)` | 4.0  | 1.0  | Yes  | 1.0
`toString()` | 4.0  | 1.0  | Yes  | 1.0
Properties of instances
`source` | 4.0  | 1.0  | Yes  | 1.0
`global` | 4.0  | 1.0  | Yes  | 1.0
`ignoreCase` | 5.5  | 1.0  | Yes  | 1.0
`multiline` | 5.5  | 1.0  | Yes  | 1.0
`lastIndex` | 4.0  | 1.0  | Yes  | 1.0

### Error object

Implementation of error objects  Error object  | MSHTML  | Gecko | WebKit | Presto

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Called as function
`Error (message)` | ?  | ?  | ?  | ?
Called as constructor
`new Error (message)` | 5.0  | 1.0  | Yes  | 1.0
Properties
`prototype` | 5.0  | 1.0  | Yes  | 1.0
Properties of prototype
`constructor` | 5.0  | 1.0  | Yes  | 1.0
`name` | 5.5  | 1.0  | Yes  | 1.0
`message` | 5.5  | 1.0  | Yes  | 1.0
`toString()` | 5.0  | 1.0  | Yes  | 1.0

### NativeError objects

Implementation of NativeError objects  NativeError object  | MSHTML  | Gecko | WebKit | Presto

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Called as function
`EvalError (message)` | ?  | 1.0  | Yes  | ?
`RangeError (message)` | ?  | 1.0  | Yes  | ?
`ReferenceError (message)` | ?  | 1.0  | Yes  | ?
`SyntaxError (message)` | ?  | 1.0  | Yes  | ?
`TypeError (message)` | ?  | 1.0  | Yes  | ?
`URIError (message)` | ?  | 1.0  | Yes  | ?
Called as constructor
`new EvalError (message)` | ?  | 1.0  | Yes  | ?
`new RangeError (message)` | ?  | 1.0  | Yes  | ?
`new ReferenceError (message)` | ?  | 1.0  | Yes  | ?
`new SyntaxError (message)` | ?  | 1.0  | Yes  | ?
`new TypeError (message)` | ?  | 1.0  | Yes  | ?
`new URIError (message)` | ?  | 1.0  | Yes  | ?
Properties
`prototype` | ?  | 1.0  | ?  | ?
Properties of prototype
`constructor` | ?  | 1.0  | ?  | ?
`name` | ?  | 1.0  | Yes  | ?
`message` | ?  | 1.0  | Yes  | ?

## References

1. ↑ E4X, Mozilla, https://developer.mozilla.org/en-US/docs/E4X
2. ↑ ECMAScript 5 Arrays, Microsoft, http://ie.microsoft.com/testdrive/HTML5/ECMAScript5Array/, retrieved 2010-06-24

## Further reading

* ECMAScript object support in Opera
* JavaScript tests & Compatibility tables
* ECMAScript 6 compatibility table

## External links

* Webdevout – mostly covers Windows browsers. Extensive bug testing.

* v
* t
* e

ECMAScript

Dialects|

* ActionScript
* Caja
* JavaScript
* engines
* asm.js
* JScript
* JScript .NET
* QtScript
* TypeScript
* WMLScript

Engines
(comparison)|

* Carakan
* Futhark
* InScript
* JavaScriptCore
* JScript
* KJS
* Linear B
* Narcissus
* QtScript
* Rhino
* SpiderMonkey
* TraceMonkey
* JägerMonkey
* Tamarin
* V8
* ChakraCore
* Chakra
* JScript .NET
* Nashorn

Frameworks|

| Client-side|

* Chaplin.js
* Dojo
* Echo
* Ext JS
* Google Web Toolkit
* jQuery
* Lively Kernel
* midori
* MochiKit
* MooTools
* Prototype
* Pyjs
* qooxdoo
* Rialto
* Rico
* script.aculo.us
* SmartClient
* SproutCore
* Spry
* Wakanda Framework

|

Server-side|

* AppJet
* Jaxer
* Node.js
* WakandaDB

Multiple|

* Cappuccino
* Objective-J
* PureMVC

Libraries|

* Backbone.js
* SWFObject
* SWFAddress
* Underscore.js

People|

* Brendan Eich
* Douglas Crockford
* John Resig
* Scott Isaacs

Other|

* DHTML
* Ecma International
* JSDoc
* JSGI
* JSHint
* JSLint
* JSON
* JSSS
* Sputnik
* SunSpider
* Asynchronous module definition
* CommonJS

Lists
JavaScript libraries
Ajax frameworks
Comparisons
JavaScript frameworks
server-side JavaScript

* v
* t
* e

JavaScript

Code analysis|

* ESLint
* JSHint
* JSLint

Transcompilers|

* Babel.js
* CoffeeScript
* LiveScript
* Dart
* Emscripten
* Google Closure Compiler
* Google Web Toolkit
* Morfik
* TypeScript
* AtScript
* Opa
* Nim
* Haxe
* ClojureScript
* WebSharper
* PureScript
* Reason
* Elm

Concepts|

* Client-side
* JavaScript library
* JavaScript syntax
* Unobtrusive JavaScript

Debuggers|

* Firebug
* Komodo IDE
* Microsoft Script Debugger
* Microsoft Script Editor
* Opera Dragonfly
* Web Inspector

Doc generators|

* JSDoc

Editors (comparison)|

* Ace
* Cloud9 IDE
* Atom
* CodeMirror
* Light Table
* Brackets
* Koding
* PhpStorm
* Orion
* Visual Studio
* Visual Studio Express
* Visual Studio Code
* Visual Studio Team Services

Engines|

* Comparison of engines
* DOM support
* List of ECMAScript engines

Frameworks|

* Comparison of JavaScript frameworks
* List of JavaScript libraries

Related technologies|

* Cascading Style Sheets
* Document Object Model
* HTML
* Dynamic HTML
* Ajax
* JSON
* WebAssembly
* asm.js

Package managers|

* npm

Application Bundlers|

* Webpack

Server-side|

* Active Server Pages
* CommonJS
* JSGI
* Node.js
* Wakanda

Unit testing|

* Jasmine
* Mocha
* QUnit
* List of JavaScript unit testing frameworks
* Jest

People|

* Douglas Crockford
* Brendan Eich
* John Resig

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