Calling a Function Using function.apply

Another way to invoke functions in JavaScript is using the .apply() method. The syntax for .apply() is as follows: functionName.apply(thisArg, [array]). "functionName" refers to the function being called. However, with .apply(), an array containing all values can be sent instead of individual arguments. Additionally, "thisArg" specifies the object that "this" references inside the invoked function.

Syntax

apply(thisArg)
apply(thisArg, argsArray)

Parameters

thisArg: The value of this provided for the call to func. If the function is not in strict mode, null and undefined will be replaced with the global object, and primitive values will be converted to objects.
argsArray Optional: An array-like object, specifying the arguments with which func should be called, or null or undefined if no arguments should be provided to the function.

Return value

The result of calling the function with the specified this value and arguments.