Delete a part of array elements in js

Question

I have an Array and want to delete X element and All elements after 'X' element in array and return previous elements

This is my array : ['A' , 'B' , 'C' , 'D' , 'X' , 'Z' , 'A' , 'B' , 'F']

And the new array I want is this : ['A' , 'B' , 'C' , 'D']

How can I did this?

Do you want to modify the array, or just return a new array with the previous elements? — Barmar, Nov 01 '21 at 21:39

Spectric · Accepted Answer · 2021-11-01T21:51:05.153

Use Array.indexOf to get the index of the target and Array.slice to get the items from index 0 to the index of the target:

const arr = ['A' , 'B' , 'C' , 'D' , 'X' , 'Z' , 'A' , 'B' , 'F']
const target = 'X'

const res = arr.slice(0, arr.indexOf(target))

console.log(res)

If you want to modify the original, use Array.splice instead:

const arr = ['A' , 'B' , 'C' , 'D' , 'X' , 'Z' , 'A' , 'B' , 'F']
const target = 'X'

arr.splice(arr.indexOf(target))

console.log(arr)

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