1. Introduction
In this short article, we are going to present methods to remove a specified element from an array in JavaScript.
2. Using splice() function
To remove an element from the array we can use
splice() function that changes the contents of an array by removing or replacing existing elements and/or adding new elements in place.
To remove an element at index
i we can use
array.splice(i, 1);
const arr = ["2","3","4","5"];
console.log('Before splice', arr);
arr.splice(2, 1);
console.log('After splice', arr); // ["2","3","5"]
3. Using delete
In case you want to remove an element from the array but also keep indexes of other elements unchanged, you can use
delete method.
const arr = ["2","3","4","5"];
console.log('Before delete', arr);
delete arr[2];
console.log('After delete', arr); // ["2","3",undefined,"5"]
4. Using ES6 filter method
If we want to remove an element from array using immutable approach (original array stay unchanged) we can use
filter method.
const arr = [2,3,4,5,6,7,8];
const even = arr.filter(el => el % 2 === 0);
console.log('After filter', even); // [2,4,6,8]
5. Conclusion
In this article, we presented a method to remove a particular element from an array in JavaScript. Fortunately, JavaScript comes with dedicated method
splice() to modify contents of an array in place, although the better way is to keep original array unchanged (immutable) and just use
filter to get only elements that we want to process in the next step.
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