Question

How to filter an array in-place with JavaScript

Answer 1

let array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];

// Filter in-place to keep only even numbers
for (let i = array.length - 1; i >= 0; i--) {
    if (array[i] % 2 !== 0) {
        array.splice(i, 1); // Remove the element if it doesn't meet the condition
    }
}

console.log(array); 

 
 
/*
run:
 
[ 2, 4, 6, 8, 10, 12 ]
 
*/

 

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