How to merge two arrays in javascript

Methods to merge two arrays are:

Method 1: Use concat

var a = [1,2,3];
var b = [4,5,6];

var c = a.concat(b);

//c=[1,2,3,4,5,6];

Method 2: Use loop

for(let i in b){
　　a.push(b[i])
}

Method 3: Use apply

a.push.apply(a,b);

When merging arrays, you can first determine the size of the arrays. It will obviously be faster to merge the larger ones with the smaller ones.

If you don’t want to change the array, It is recommended to use the concat method.

Recommended tutorial: js introductory tutorial

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