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In es6, "for of" is used to traverse data structures with the "Symbol.iterator" attribute deployed, and the "for of" loop is a method to traverse all data structures with the syntax "for (var value of data structure object) {console.log (value);}".

This tutorial operating environment: windows10 system, ECMAScript version 6. 0, Dell G3 computer.

What is the use of for of in es6

ES6 introduces the for...of loop as a unified method for traversing all data structures.

A data structure is considered to have an iterator interface as long as the Symbol.iterator attribute is deployed, and its members can be traversed with a for...of loop, that is, the Symbol.iterator method of the data structure is called inside the for...of loop.

The range that the for...of loop can use:

String

Array

Set and Map structure

Some array-like objects (such as arguments objects, DOM NodeList objects)

Generator object.

Use examples

Var arr = ['nick','freddy','mike','james']; for (var item of arr) {console.log (item);}

Output result:

Iterate through every item in the array.

Use examples

Var arr = [{name:'nick', age:18}, {name:'freddy', age:24}, {name:'mike', age:26}, {name:'james', age:34}]; for (var item of arr) {console.log (item.name,item.age);}

Output result:

Iterate through every item in the array.

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