The Future of JavaScript (ECMAScript-5)

Alexander Tarasyuk

Array• indexOf()• lastIndexOf()• every()• filter()• forEach()• map()• some()• isArray()• reduce()• reduceRight()

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indexOf

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lastIndexOf

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every

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filter

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forEach

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map

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some

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isArray

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reduce

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reduceRight

String• trim()

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Date• now()• toISOString()

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toISOString

Object• create()• defineProperty()• defineProperties()• keys()• getOwnPropertyDescriptor()• getOwnPropertyNames()• getPrototypeOf()• seal()• isSealed()• freeze()• isFrozen()• preventExtensions()• isExtensible()

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create

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Inheritance

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defineProperty

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writable, configurable, enumerable

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getters / setters

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keys

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getOwnPropertyNames

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getOwnPropertyDescriptor

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getPrototypeOf

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seal, isSealed

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freeze, isFrozen

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preventExtensions, isExtensible

JSON• parse()• stringify()

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parse

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stringify

Function• bind()

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bind

Strict Mode• eval('"\010"')- is a SyntaxError• eval('010')- is a SyntaxError• __i_dont_exist = 1; - is a ReferenceError• eval = 1; - is a SyntaxError• arguments = 1; - is a SyntaxError• eval++; - is a SyntaxError• arguments++; - is a SyntaxError• arguments.caller; - is a TypeError• (function(x){ x = 2; return arguments[0] === 1; })(1);• (function(x){ arguments[0] = 2; return x === 1; })(1);• ({ x: 1, x: 1 }); - is a SyntaxError• ({ set x(eval){ } }); - is a SyntaxError• ({ set x(arguments){ } }); - is a SyntaxError• eval('var x'); x; - is a ReferenceError• (function(){ return this === undefined; })();• (function(){ return this === undefined; }).call();• var x; delete x; - is a SyntaxError• delete (function(){}).length; - is a TypeError• (function f() { f = 123; })() - is a TypeError• Object.defineProperty({ }, "x", { writable: false }).x = 1• .......

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Compatibility table

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ECMASCript-6• let• function main(a = 1) {} • const• Proxy Objects• module• import• yield • ......

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Thank You