Delete elements from array javascript

Question

Maybe by title seems a easy question, but I didn´t know how to do the shortest title for my question.
I want to delete elements from array on javascript, yes, but what I am looking for exactly is delete from array mismatched elements with other array on javascript (maybe it could be title, but too large).
For example:

Array A=> [a, b, c, d]  
Array B=> [b,d]  
Array C = deleteMismatchedElements(A,B)  
Array C (after function)-> [b,d]

I suppose that using a nested foreach loop it could be possible, but I wonder if there is a better way, something as a "native" implemented method that could be called, or similar...

Thank you very much.

for the first glance i thought you need arrays difference, but i cannot understand what you really want ? — AhmadAssaf, Apr 17 '15 at 23:48
You should probably provide an example where B is not a subset of A. I believe you are looking for array intersection. That would be a duplicate of http://stackoverflow.com/q/1885557/218196 — Felix Kling, Apr 17 '15 at 23:48
You want the __set intersection__ of the arrays. Just so you know the terminology. — Benjamin Gruenbaum, Apr 17 '15 at 23:53

score 3 · Accepted Answer · answered Apr 17 '15 at 23:51

3

var C = [];
for(var i = 0; i < B.length; i ++){
    if(A.indexOf(B[i]) > -1){
        C.push(B[i]);
    }
}

What this does is

Creates array C
Runs through each item in B
if B[i] is in A, add it to C

answered Apr 17 '15 at 23:51

raumaan kidwai

356
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`A.filter(b.includes.bind(b))` – Benjamin Gruenbaum Apr 17 '15 at 23:53
... Wait wait wait let me get my head around this. JavaScript has a filter method for arrays. What have I been doing with my life for the past month? – raumaan kidwai Apr 17 '15 at 23:57
There you go: http://stackoverflow.com/a/1885569/218196 – Felix Kling Apr 17 '15 at 23:59
@FelixKling I think mine is simpler :D – Benjamin Gruenbaum Apr 18 '15 at 00:00
@Benjamin: true, but `includes` doesn't seem to be native :P – Felix Kling Apr 18 '15 at 00:01
It is, it's just new :) (It'll take a while though because everyone is busy with ES6 now :D) – Benjamin Gruenbaum Apr 18 '15 at 00:02
@Benjamin: Oh, ES7. That doesn't count :P – Felix Kling Apr 18 '15 at 00:03

Delete elements from array javascript

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