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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.
Checks if the passed value is a finite number
Checks if a value is NaN or not
Parses string and returns integer of given radix
Parses argument and returns floating-point number