Deleting an Element from an Array in JavaScript

Deleting elements from arrays is a common task in JavaScript. Here’s a step-by-step guide on how to do it efficiently with DSA approach.

Simple Deletion Method

1. Start the loop at the position of the element to delete.
2. Copy the next element to the current position.
3. Pop the last element to remove the extra space.

let data = [41, 23, 63, 42, 59];
let deletePosition = 0;
for (let i = deletePosition; i < data.length; i++) {
  data[i] = data[i + 1];
}
data.pop();
console.log(data); // Output: [23, 63, 42, 59]

Handling Errors

To prevent issues with invalid positions (negative or out of bounds), add error handling:

let data = [41, 23, 63, 42, 59];
let deletePosition = 5;

if (deletePosition < 0 || deletePosition >= data.length) {
  console.error("Position out of bounds");
} else {
  for (let i = deletePosition; i < data.length; i++) {
    data[i] = data[i + 1];
  }
  data.pop();
  console.log(data); // Output: [41, 23, 63, 42, empty]
}

Optimized Approach

An optimized way maintains the original data integrity by creating a new array:

let data = [41, 23, 63, 42, 59];
let deletePosition = 2; // Adjusting for zero-based index

let newData = [];
let newIndex = 0;

for (let i = 0; i < data.length; i++) {
  if (i !== deletePosition) {
    newData[newIndex] = data[i];
    newIndex++;
  }
}

console.log(newData); // Output: [41, 23, 42, 59]

This approach ensures your data remains intact while efficiently removing the desired element. Always remember to handle errors to avoid unexpected results.

Yoo!
Happy coding!

Comments

[Robert Frunzke]

What about splice or toSpliced?

ie:

let newData = data.toSpliced(deletePosition,1);

[Syed Muhammad Ali Raza]

there is more ways ,nowadays developer used filter, splice method

[Andrew Saeed]

Clear and concise, Vraj!