Javascript: get values that contain in all arrays

Question

There are multiple arrays

[1,2,3]
[2,3,4]
[2,4,5]

Now I want to get the values that contain in all arrays. In this example it would be [2]. Is there an easy way to do this?

I tired https://stackoverflow.com/a/14438954/639035 however, if I try it with three arrays after each other, I get wrong results (4 would be included).

Update Posted answer works, the error was in another part of my code

If your desired output is `[2]`, aren't you looking for the *non-*unique values? I.e.: the value that appears in every array. — user3297291, Feb 21 '18 at 16:38
Ahhh the error was in another part of the code.... not shure if I should delete it :/ Solution posted in the answer works! — Stefan, Feb 21 '18 at 16:44
Cannot delete it anymore (too many answers, comments) will accept @Mohammad Usman answer — Stefan, Feb 21 '18 at 16:46

score 2 · Accepted Answer · edited Feb 21 '18 at 16:47

2

You may use:

Example:

let a1 = [1, 2, 3];
let a2 = [2, 3, 4];
let a3 = [2, 4, 5];

let result = a1.filter(v => a2.includes(v) && a3.includes(v));

console.log(result);

edited Feb 21 '18 at 16:47

Ele

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answered Feb 21 '18 at 16:38

Mohammad Usman

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This solution is against what was stated in the questions title. – Ele Feb 21 '18 at 16:44
1

@Ele I assumed OP wants to filter values that exists in all arrays. At least this is what his expected output tells us. – Mohammad Usman Feb 21 '18 at 16:46
1

@MohammadUsman, I think it's that, I edited the post and he approved with that change – Guilherme Holtz Feb 21 '18 at 16:52

score 0 · Answer 2 · edited Feb 21 '18 at 16:48

0

This will work:

let a = [1,2,3];
let b = [2,3,4];
let c = [2,4,5];

let result = a.reduce((total, elem) => {
    if((b.indexOf(elem) !== -1) && (c.indexOf(elem) !== -1)) {
        total.push(elem);
    }
    return total;
}, []);

console.log(result);

edited Feb 21 '18 at 16:48

Ele

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answered Feb 21 '18 at 16:43

David Vicente

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Javascript: get values that contain in all arrays

2 Answers2