How to get the difference between two arrays in JavaScript?

Question

How to get the difference between two arrays in JavaScript?

Is there an approach to return the distinction between two arrays in JavaScript?

For example:

var a1 = ['a', 'b'];

var a2 = ['a', 'b', 'c', 'd'];



// need ["c", "d"]

array java

4 years ago by Kajalsi45d

2 Answers

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**akshay1995** · Answer 1 · 2021-05-28T12:05:59



Array.prototype.diff = function(a) {

    return this.filter(function(i) {return a.indexOf(i) < 0;});

};



//////////////

// Examples //

//////////////



const dif1 = [1,2,3,4,5,6].diff( [3,4,5] );  

console.log(dif1); // => [1, 2, 6]





const dif2 = ["test1", "test2","test3","test4","test5","test6"].diff(["test1","test2","test3","test4"]);  

console.log(dif2); // => ["test5", "test6"]

**kshitijrana14** · Answer 2 · 2021-05-29T12:40:26

This is by far the easiest way to get exactly the result you are looking for, using jQuery:

var diff = $(old_array).not(new_array).get();

diff now contains what was in old_array that is not in new_array

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How to get the difference between two arrays in JavaScript?

2 Answers

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