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2 Answers
You could use filter or reduce, or copy the array first by using slice, and then perform splice.
Personally, I like filter for its simplicity, and clear intention
filter
function removeItem(array, n) {
return array.filter((elem, i) => i !== n);
}
const original = [1,2,3,4];
console.log(removeItem(original, 1));
console.log(original);reduce
function removeItem (array, n) {
return array.reduce((result, elem, i) => {
if (i !== n) result.push(elem);
return result;
}, [])
}
const original = [1,2,3,4];
console.log(removeItem(original, 1));
console.log(original);slice and splice
function removeItem(array, n) {
const result = array.slice();
result.splice(n, 1);
return result;
}
const original = [1,2,3,4];
console.log(removeItem(original, 1));
console.log(original);Performance Test
Documentation
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/slice
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice
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