How to Use Slice in Order to Remove an Element from an Array in Javascript

Assume we have the following array and we want to remove Robert from the array:

const names = ['Peter', 'John', 'Sally', 'Robert', 'Laila'];

const index = 3;

const newNames = [...names.slice(0, index), ...names.slice(index +  1)];

console.log(newNames);

What we are doing with the newNames array is creating a new array composed of two parts:

names.slice(0, index) - Return the names array with elements from 0 to index-1.
names.slice(index + 1) - Return the names array with elements from index+1 to the end of the names array.

Taking 1 and 2 above, we then use the spread operator in order to have both results in the new array. The new array is then: ['Peter', 'John', 'Sally', 'Laila'].

If we didn’t know the index of Robert in the array, we can use the indexOf() function as follows:

const index = names.indexOf('Robert');