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Javascript – How can I find the index of any value in array and then remove it?

In an array I want to find the index of a value and then remove that value. The constraint is that I have to use core JavaScript without any frameworks.

let array = [9,8,7,6,5,4,3,2,1];

How can I find the index of ‘4’ and remove it from the array using core JavaScript?

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2

Answers


  1. 0 
    let array = [9, 8, 7, 6, 5, 4, 3, 2, 1];

// Find the index of the value '4'
let index = array.indexOf(4);

// array is valid length
if (index !== -1) {
  // Remove the value at index
  array.splice(index, 1);
}

console.log(array);
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  2. 0

    You don’t need to find the value from Index 4 in order to remove it, you can just blindly remove it using Array.splice()

    let array = [9,8,7,6,5,4,3,2,1];
const indexFound = array.findIndex(el => el === 4);
console.log('Value at index 4 found:', indexFound);

array.splice(4);

console.log(array)
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