merge 2nd array in 1st array jquery?

Question

I have 2 arrays, array1 and array2. Both have some values but not the same length.

I want to concatenate array2 into array1.

I have tried this but it is not working:

array1 = array1.concat(array2);

Answer 1

To just merge the arrays without removing duplicates

ES5 version use Array.concat:

var array1 = ["foo","bar"];
var array2 = ["bar", "biz"];
var array3 = array1.concat(array2);

ES6 version use destructuring

const array1 = ["foo","bar"];
const array2 = ["bar", "biz"];
const array3 = [...array1, ...array2];

Result

// [ 'foo', 'bar', 'bar', 'biz' ]

Merge the arrays WITH removing duplicates

var array1 = ['foo', 'bar', 'biz'], array2 = ['delta', 'bar', 'foo', 'tango'];

var array3 = array1.concat(array2.filter(function (item) {

    return array1.indexOf(item) < 0;
}));

Result:

// ["foo", "bar", "biz", "delta", "tango"]

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