Javascript - delete array from array

Question

I want to delete elements from array in array (can't remember how it is named in math), for example:

var arr1 = ['uno', 'dos', 'tres', 'cuatro'],
    arr2 = ['dos', 'cuatro'],
    arr3 = arr1.without(arr2);
//arr3 === ['uno', 'tres']

Greetings

I think the math term that you are looking for is called 'set difference'. — Mμ.
– Mμ., Commented Apr 13, 2017 at 10:57

kind user · Accepted Answer · 2017-04-13 10:32:11Z

3

Array#filter may be helpful.

var arr1 = ['uno', 'dos', 'tres', 'cuatro'],
    arr2 = ['dos', 'cuatro'],
    arr3 = arr1.filter(v => arr2.indexOf(v) == -1);
    
    console.log(arr3);

answered Apr 13, 2017 at 10:32

kind user

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2 Comments

Jimi Alvaro Over a year ago

I hoped there is some native function for it, but thanks!

kind user Over a year ago

@JimiAlvaro Native function? Array#filter is definetely native (:

Mamun · Accepted Answer · 2017-04-13 10:35:15Z

2

var arr1 = ['uno', 'dos', 'tres', 'cuatro'];
var arr2 = ['dos', 'cuatro'];

arr1 = arr1.filter(function(item){
  return arr2.indexOf(item) < 0;
});
console.log(arr1)

answered Apr 13, 2017 at 10:35

Mamun

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Comments

Nina Scholz · Accepted Answer · 2017-04-13 10:46:40Z

0

You could use Array#includes and take the negated result.

var arr1 = ['uno', 'dos', 'tres', 'cuatro'],
    arr2 = ['dos', 'cuatro'],
    arr3 = arr1.filter(v => !arr2.includes(v));
    
console.log(arr3);

answered Apr 13, 2017 at 10:46

Nina Scholz

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Comments

Alex Link · Accepted Answer · 2017-10-27 15:04:09Z

0

Here you are, a ready function for that:

function substractArrays (arr1, arr2) {
    if (arr2.length) {
      return arr1.filter(item => {
        return !arr2.some(elem => {
          return item.id === elem.id;
        });
      });
    } else {
      return arr1;
    }
}

answered Oct 27, 2017 at 15:04

Alex Link

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