How to use filter() Method In Javascript
In this approach, we will filter all the elements which are equal and compare the length of the new array with the original array.
Example: This example shows the use of filter() Method for checking the equality of all the element in the given array.
const arr = [1, 1, 1, 1];
const arr1 = [1, 1, 2];
function allEqual(array) {
return (
array.filter(element => {
return element === array[0];
}).length === array.length
);
}
console.log(allEqual(arr));
console.log(allEqual(arr1));
Output
true false
Knowing about to check if all values in an array are equal enhances your capability to manage and validate data effectively. This guide introduces the importance and prerequisites, preparing you to explore various methods in detail. By focusing on practical applications, you can improve your JavaScript skills and code reliability.
How to check all values of an array are equal or not in JavaScript ?
Ensuring all values in an array are equal is a common task in JavaScript, useful for validating data consistency and simplifying conditional checks. This guide provides an overview of efficient methods to determine if an array contains identical elements.
Below are the approaches used to check if all values of an array are equal or not in JavaScript:
Table of Content
- 1. Using Array.every() method
- 2. Using Array.reduce() method
- 3. Using Set
- 4. Using for…of loop
- 5. Using filter() Method