CODEWITHSUNDEEP
javascriptjqueryarrays
Bosco
Bosco

Reputation: 57

Remove elements from array with another array containing duplicates javascript

I have 2 arrays, I want to delete the elements from first array with the second ones just once conserving the other duplicates that might be:

array1 = [1,1,1,1,2,2,2,2];
array2 = [1,1,2];

//resultingArray = [1,1,2,2,2];

It seems that all the answers I got are about removing duplicates while searching for this..

I'm wondering if there's a way to do this with filter, but it only seems to filter all the entries

resultingArray = array1.filter(function(el){
   return array2.indexOf(el) === -1;
});

//resultingArray = [];

Another way that I could think of is removing each one of the array elements one by one like this

for( var i = 0; i < arr.length; i++){ 
   if ( arr[i] === Number) {
     arr.splice(i, 1);
     i = arr.length;
};

But it doesn't seem to be a great way to do this?

And again the difference between those arrays will remove all the duplicated elements

Would appreciate to know the best method for this or directions to a duplicated posts that i couldn't find!!

Upvotes: 0

Views: 583

Answers (1)

Rory McCrossan
Rory McCrossan

Reputation: 337743

To achieve this you can loop through array2 removing the first matching item matching the current value in array1. Something like this:

let array1 = [1,1,1,1,2,2,2,2];
let array2 = [1,1,2];

array2.forEach(i => array1.splice(array1.indexOf(i), 1));

console.log(array1);

Upvotes: 1

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