TypeScript Array some()
Syntax & Examples

Array.some() method

The some() method tests whether at least one element in the array passes the test implemented by the provided callback function. It returns a Boolean value.

Syntax of Array.some()

The syntax of Array.some() method is:

some(callbackfn: function, thisArg?: any): boolean

This some() method of Array determines whether the specified callback function returns true for any element of an array.

Parameters

ParameterOptional/RequiredDescription
callbackfnrequiredA function to test for each element, taking three arguments: the current element, the index of the current element, and the array being traversed.
thisArgoptionalValue to use as this when executing callbackfn.

Return Type

Array.some() returns value of type boolean.


✐ Examples

1 Using some() to test for values greater than a number

The some() method can be used to check if any elements in the array are greater than a specified number.

For example,

  1. Create an array arr with numeric values [1, 2, 3, 4, 5].
  2. Define a callback function that checks if an element is greater than 3.
  3. Use some(callbackfn) to test if any elements are greater than 3.
  4. Store the result in result.
  5. Log result to the console.

TypeScript Program

const arr = [1, 2, 3, 4, 5];
const result = arr.some(element => element > 3);
console.log(result);

Output

true

2 Using some() to test for even numbers

The some() method can be used to check if any elements in the array are even.

For example,

  1. Create an array arr with numeric values [1, 3, 5, 7, 8].
  2. Define a callback function that checks if an element is even.
  3. Use some(callbackfn) to test if any elements are even.
  4. Store the result in result.
  5. Log result to the console.

TypeScript Program

const arr = [1, 3, 5, 7, 8];
const result = arr.some(element => element % 2 === 0);
console.log(result);

Output

true

3 Using some() to test for presence of a specific element

The some() method can be used to check if a specific element exists in the array.

For example,

  1. Create an array arr with string values ['apple', 'banana', 'cherry'].
  2. Define a callback function that checks if an element is 'banana'.
  3. Use some(callbackfn) to test if 'banana' is present in the array.
  4. Store the result in result.
  5. Log result to the console.

TypeScript Program

const arr = ['apple', 'banana', 'cherry'];
const result = arr.some(element => element === 'banana');
console.log(result);

Output

true

Summary

In this TypeScript tutorial, we learned about some() method of Array: the syntax and few working examples with output and detailed explanation for each example.