w3resource

JavaScript: Return true if the provided predicate function returns true for at least one element in a collection, false otherwise

JavaScript fundamental (ES6 Syntax): Exercise-255 with Solution

Write a JavaScript program that returns true if the provided predicate function returns true for at least one element in a collection, false otherwise.

  • Use Array.prototype.some() to test if any elements in the collection return true based on fn.
  • Omit the second argument, fn, to use Boolean as a default.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
// Define a function 'any' that checks if any element in the array satisfies the provided condition
const any = (arr, fn = Boolean) => arr.some(fn);

// Test the 'any' function with different arrays and conditions
console.log(any([0, 1, 2, 0], x => x >= 2)); // true (at least one element is greater than or equal to 2)
console.log(any([0, 0, 1, 0])); // true (at least one element is truthy)

Output:

true
true

Flowchart:

flowchart: Return true if the provided predicate function returns true for at least one element in a collection, false otherwise.

Live Demo:

See the Pen javascript-basic-exercise-255-1 by w3resource (@w3resource) on CodePen.


Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript program to generate a UUID in Node.JS. Use crypto API to generate a UUID, compliant with RFC4122 version 4.
Next: Write a JavaScript program to check if two given numbers are approximately equal to each other.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Become a Patron!

Follow us on Facebook and Twitter for latest update.

It will be nice if you may share this link in any developer community or anywhere else, from where other developers may find this content. Thanks.

https://www.w3resource.com/javascript-exercises/fundamental/javascript-fundamental-exercise-255.php