How to use every() or some() methods in JavaScript ?
Last Updated :
22 Feb, 2024
In JavaScript, the every() and some() methods are array methods used to check the elements of an array based on a given condition.
- every(): Checks if all elements in an array satisfy a condition.
- some(): Checks if at least one element in an array satisfies a condition.
every() Method
The every() method tests whether all elements in the array passed the condition given to the callback function. It returns a boolean value indicating whether all elements satisfy the condition.
Syntax:
array.every(callback(element[, index[, array]])[, thisArg])
Parameters:
- callback: Function to test for each element.
- element: The current element being processed in the array.
- index (Optional): The index of the current element being processed in the array.
- array (Optional): The array some() was called upon.
- thisArg (Optional): Object to use as this when executing the callback.
Return Value:
It returns true, if all elements of array passed the given condition. Otherwise, it will return false.
Example: The below example implements the every() method with an array in javaScript.
JavaScript
const arr1 = [1, 2, 3, 4, 5];
const arr2 = [3, 5, 8, 9, 11];
const res1 =
arr1.every(num => num < 10);
const res2 =
arr2.every(num => num < 10);
console.log(res1, res2);
some() Method
The some() method tests whether at least one element in the array passes the test implemented by the provided function. It returns a boolean value indicating whether at least one element satisfies the condition.
Syntax:
array.some(callback(element[, index[, array]])[, thisArg])
Parameters:
- callback: Function to test for each element.
- element: The current element being processed in the array.
- index (Optional): The index of the current element being processed in the array.
- array (Optional): The array some() was called upon.
- thisArg (Optional): Object to use as this when executing the callback.
Return Value:
It returns true, if any one element of the array passed the given condition. Otherwise, it will return false.
Example: The below code implements the some() method to check elements of an array for a passed condition.
JavaScript
const numbers = [1, 2, 3, 5, 7, 9];
const odd = [1, 3, 5, 7, 9];
const res1 =
numbers.some(num => num % 2 === 0);
const res2 =
odd.some(num => num % 2 === 0);
console.log(res1, res2);
Similar Reads
How to get all the methods of an object using JavaScript? In this article, we will learn how to get all the methods of an object using JavaScript. In JavaScript, we can get all the methods of an object by iterating over each object and checking if its property value is a function. An HTML document contains some methods and the task is to get all methods of
2 min read
JavaScript Array some() Method The some() method checks if any array elements pass a test provided as a callback function, returning true if any do and false if none do. It does not execute the function for empty elements or alter the original array.Syntaxarr.some(callback(element,index,array),thisArg);Parameterscallback: This pa
3 min read
JavaScript Promise any() Method JavaScript Promise any() method is a static method that takes an array of promises as a parameter and returns the first fulfilled promise. It returns a rejected value when all of the promises in the array return rejects or if the array is empty. When all the promises are rejected an AggregateError i
2 min read
How to define custom Array methods in JavaScript? JavaScript arrays are versatile data structures used to store collections of items. When you want to iterate through the elements of an array, it's common to use loops like for, for...of, or forEach. However, there's a nuance when it comes to iterating through arrays that have additional properties
2 min read
JavaScript Promise all() Method The Promise.all() method in JavaScript is used for handling multiple asynchronous operations simultaneously. It takes an array (or any iterable) of promises and returns a single promise that resolves when all the input promises resolve or reject if any one of the promises fails. This makes it ideal
6 min read
Map() vs Filter() Methods in JavaScript In JavaScript, the map() and filter() methods are powerful array functions that allow you to transform and filter arrays easily. We will discuss the required concepts about each method in this article.What is map() in JavaScript?The map() method creates a new array by applying a given function to ea
3 min read