JavaScript Built-In Functions

In JavaScript, built-in functions are the global functions that are called globally, rather than on an object.

In this reference page, you will find all the JavaScript built-in functions and their properties. For example, the parseInt() function returns an integer from a given string value.

JavaScript isFinite()

Checks if the passed value is a finite number

Javascript isNaN()

Checks if a value is NaN or not

JavaScript parseInt()

Parses string and returns integer of given radix

JavaScript parseFloat()

Parses argument and returns floating-point number