JavaScript: Remove a specific item from an Array

Although this is not a problem - many programmers have difficulty removing an element from an array into JavaScript. To remove an item from an array, you can use special methods, such as:

shift – the method will remove the element from the beginning of the array.

splice – this method removes the element from the middle of the array.

pop – this method removes the element from the end of the array.

With the splice method, you can remove elements, insert elements, and replace elements.

Example:

arr.splice(start[, countDelete[, elemInsert1, ..., elemInsertN]])

Removal of an element from an array:

let arr = ["Hello", "World", "Forest"];
arr.splice(1, 1);  // starting from position 1, delete 1 item
console.log(arr);  // ["Hello", "Forest"]

let arr = ["Hello", "World", "Galaxy", "David"]
arr.splice(0, 3, "Hey!")
console.log(arr) // ["Hey!", "David"]

Remove a specific item from an array:

const array = [1, 2, 3];

const index = array.indexOf(2);
if (index > -1) {
  array.splice(index, 1);
}

console.log(array); // [1, 3]

Removing item (ECMAScript 6 code):

let value = 7
let arr = [1, 2, 7, 4, 5, 7]
arr = arr.filter(item => item !== value)
console.log(arr)  // [ 1, 2, 4, 5]

Removing multiple items (ECMAScript 7 code):

let forDelete = [2, 3, 5]
let arr = [1, 2, 3, 4, 5, 3]

arr = arr.filter(item => !forDelete.includes(item))
console.log(arr) // [ 1, 4 ]

ES6 & without mutation:

const removeByIndex = (list, index) =>
      [
        ...list.slice(0, index),
        ...list.slice(index + 1)
      ];
         
output = removeByIndex([11, 22, 33, 44], 1) //=> [11, 33, 44]
console.log(output)