JavaScript arr.some() method checks whether at least one of the elements of the array satisfies the condition checked by the argument method. The some() method does not change the original array.
Array some() Method Syntax
arr.some(callback(element,index,array),thisArg);Array some() Method Parameters
-
callback: This parameter holds the function to be called for each element of the array.
- element: The parameter holds the value of the elements being processed currently.
- index: This parameter is optional, it holds the index of the currentValue element in the array starting from 0.
- array: This parameter is optional, it holds the complete array on which Array.every is called.
- thisArg: This parameter is optional, it holds the context to be passed as this is to be used while executing the callback function. If the context is passed, it will be used like this for each invocation of the callback function, otherwise undefined is used as default.
Array some() Method Return value
Returns true if any of the array elements pass the test, otherwise false.
Array some() Method Example
Here, we will check whether the values are equal using the some() method.
function checkAvailability(arr, val) {
return arr.some(function (arrVal) {
return val === arrVal;
});
}function func() {
// Original function
let arr = [2, 5, 8, 1, 4];
// Checking for condition
console.log(checkAvailability(arr, 2));
console.log(checkAvailability(arr, 87));
}func(); |
true false
Explanation
- In this example the Function checkAvailability checks if a value exists in an array using some().
- Function func tests checkAvailability to see if 2 and 87 exist in the array.
- Returns true if either 2 or 87 exists in the array [2, 5, 8, 1, 4].
Array some() Method Example
Here, method some() checks for any number that is greater than 5. Since there exists an element that satisfies this condition, thus the method returns true.
function isGreaterThan5(element, index, array) {
return element > 5;
}function func() {
// Original array
let array = [2, 5, 8, 1, 4];
// Checking for condition in array
let value = array.some(isGreaterThan5);
console.log(value);
}func(); |
true
Explanation
- In this example the Function isGreaterThan5 checks if any element in an array is greater than 5.
- Function func uses some() method to verify if any element in array satisfies condition.
- Output is true if any element in array [2, 5, 8, 1, 4] is greater than 5.
Array some() Method Example
Here, the method some() checks for any number that is greater than 5. Since there exists no elements that satisfy this condition, thus the method returns false.
function isGreaterThan5(element, index, array) {
return element > 5;
}function func() {
// Original array
let array = [-2, 5, 3, 1, 4];
// Checking for condition in the array
let value = array.some(isGreaterThan5);
console.log(value);
}func(); |
false
Explanation
- In this example the Function isGreaterThan5 checks if any element in an array is greater than 5.
- Function func uses some() to verify if any element in array satisfies condition.
- Output is true if any element in array [-2, 5, 3, 1, 4] is greater than 5.
We have a complete list of Javascript Array methods, to check those please go through this Javascript Array Complete reference article.