how to splice a value in javascript code example

Example 1: splice javascript

let arrDeletedItems = arr.splice(start[, deleteCount[, item1[, item2[, ...]]]])

Example 2: splice from array

let myFish = ['angel', 'clown', 'mandarin', 'sturgeon']
let removed = myFish.splice(2, 0, 'drum')

// myFish is ["angel", "clown", "drum", "mandarin", "sturgeon"] 
// removed is [], no elements removed