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Showing content from https://webplatform.github.io/docs/javascript/Function/apply below:

apply · WebPlatform Docs

apply Summary

Calls the function, substituting the specified object for the this value of the function, and the specified array for the arguments of the function.

Syntax

apply([ thisObj [, argArray ]])

thisObj: Optional. The object to be used as the this object.
argArray: Optional. A set of arguments to be passed to the function.

Examples

The following code shows how to use the apply method.

function callMe(arg1, arg2){
     var s = "";

     s += "this value: " + this;
     s += "<br />";
     for (i in callMe.arguments) {
         s += "arguments: " + callMe.arguments[i];
         s += "<br />";
     }
     return s;
 }

 document.write("Original function: <br/>");
 document.write(callMe(1, 2));
 document.write("<br/>");

 document.write("Function called with apply: <br/>");
 document.write(callMe.apply(3, [ 4, 5 ]));

Remarks

If argArray is not a valid object, then an “Object expected” error occurs.

If neither argArray nor thisObj are supplied, the original this object is used as thisObj and no arguments are passed.