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[ES6] 19. for ... of
In ES5, we have for ... in:
var phones = ["iPhone", "Nexus", "Nokia"];for(i in phones){ console.log(phones[i]);}//iPhone//Nexus//Nokia
What we get from for...in is index of array.
In ES6, for ... of can get value from array:
var phones = ["iPhone", "Nexus", "Nokia"];for(phone of phones){ console.log(phone);}//iPhone//Nexus//Nokia
Using for...of on object:
var es6 = { edition: 6, committee: "TC39", standard: "ECMA-262"};for (e in es6) { console.log(e);}// edition// committee// standardvar engines = Set(["Gecko", "Trident", "Webkit", "Webkit"]);for (var e of engines) { console.log(e);}// Gecko// Trident// Webkitvar es6 = new Map();es6.set("edition", 6);es6.set("committee", "TC39");es6.set("standard", "ECMA-262");
for (var [name, value] of es6) { console.log(name + ": " + value);}// edition: 6// committee: TC39// standard: ECMA-262
See more: http://javascript.ruanyifeng.com/advanced/ecmascript6.html#toc17
[ES6] 19. for ... of
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