Question 396618 in Javascript Question posted in
A very good W3school tutorial can be found here.

Javascript – How do i remove two of the same item from an array

im working my way through the odin project and looking at for loops and different methods. Im trying to find a way to pass this test :

test('removes multiple of the same value', () => {
expect(removeFromArray([1, 2, 2, 3], 2)).toEqual([1, 3]);
});

I know you can remove a duplicate using filter and Sets but how do i remove both the 2’s in the array so i end up with [1, 3]

I know this is probably simple but its just where im upto at the moment.

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3

Answers


  1. Chosen as BEST ANSWER
    0

    Ok I came up with this :

    const array = [1, 2, 2, 3];

function removeFromArray(){
 
let uniqueArray = [...new Set(array)];
uniqueArray.splice(1,1);
return uniqueArray;

  
}

removeFromArray();

    It passed the test.Not sure its the right way to do things but it works and i understand it so thats a bonus.

    Jabaa, thanks for your prompt. Sometime with JS I just cant think straight.


  2. 0

    You can iterate twice over the array. In the first iteration, you count the occurrences of the elements and in the second iteration you remove elements with occurrence > 1.

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  3. 0 
    function removeFromArray(arr) {

if(!arr ||!arr.length){
return [];
}
const remElem = {};

const all = arr.reduce((all,cur) => {
if(!all[cur]) {
all[cur] = true;
} else {
remElem[cur] = true;
}}, {}) ;

return Object.keys(all).filter(cur => !remElem[cur]);
}

    Wrote on cellphone, cant test, please test, it should work 🙂

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