concatenation in array javascript using plus sign

Question

I was trying to concatenate two array using + sign but result i was getting is:first array's last element is concatenated to first element of second array why it is happening is there is any specific reason I tried

var a=[1,2,3]; 
var b=[5,7,8]; 
console.log(a+b);

I got result 1,2,35,7,8

`+` operator concatenates strings, not arrays. Your arrays are converted to strings before concatenation. — Teemu, Aug 13 '15 at 16:40
Related: http://stackoverflow.com/questions/1584370/how-to-merge-two-arrays-in-javascript-and-de-duplicate-items — Jędrzej Chałubek, Aug 13 '15 at 16:40

score 5 · Answer 1 · answered Aug 13 '15 at 16:40

5

+ operator turns arrays into strings, use Array.prototype.concat instead.

console.log(a.concat(b));

answered Aug 13 '15 at 16:40

keune

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concatenation in array javascript using plus sign

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