What is the difference between every() and some() methods in JavaScript ?

In this article, we will see the difference between every() and some() methods in JavaScript.

Array.every() method

The Array.every() method in JavaScript is used to check whether all the elements of the array satisfy the given condition or not. The output will be false if even one value does not satisfy the element, else it will return true, and it opposes the some() function.

Syntax:

// Arrow function
every((element) => { /* … */ })
every((element, index) => { /* … */ })
every((element, index, array) => { /* … */ })

Example: This example implements the every() method. 

javascript

// JavaScript code for every() function
function isodd(element, index, array) {
    return (element % 2 == 1);
}

function geeks() {
    let arr = [6, 1, 8, 32, 35];

    // check for odd number
    let value = arr.every(isodd);
    console.log(value);
}
geeks();

Output

false

Array.some() method

The Array.some() method in JavaScript is used to check whether at least one of the elements of the array satisfies the given condition or not. and it accepts true/false boolean expressions, The only difference is that the some() method will return true if any predicate is true while every() method will return true if all predicates are true. 

Syntax:

arr.every(callback(element,index,array),thisArg);

Example: This example implements the some() method. 

javascript

// JavaScript code for some() function
function isodd(element, index, array) {
    return (element % 2 == 1);
}

function geeks() {
    let arr = [6, 1, 8, 32, 35];

    // check for odd number
    let value = arr.some(isodd);
    console.log(value);
}
geeks();

Output

true

Differences between Array.every() and Array.some()

Array.every()	Array.some()
The Array.every() method is used to check whether all the elements of the array satisfy the given condition or not.	The Array.some() method is used to check whether at least one of the elements of the array satisfies the given condition or not.
The every() method will return true if all predicates are true	The  some() method will return true if any predicate is true
This method executes a function for each array element.	This method does not execute the function for empty array elements.
This method does not execute the function for empty elements.	This method does not change the original array.
This method does not change the original array	Its return value is of Boolean type
Its Syntax is: array.every(function(value, index, array), thisValue)	Its syntax is: array.some(function(value, index, array), this)
Its supported browsers are: Chrome, Internet Explorer 9 – 11, Firefox, Safari, Microsoft Edge, Opera	Its supported browsers are: Chrome, Internet Explorer, Firefox, Safari, Microsoft Edge, Opera