learn-co-students/js-object-oriented-bind-call-apply-this-lab-online-web-sp-000

Bind, Call, Apply Lab

Objectives

• Use JavaScript's bind, call, and apply methods to change function's scope and properly pass arguments

Instructions

In this lab, our tests define functions that are then passed through to functions we ask you to write. Your functions should not only invoke the functions passed as arguments, but also modify the this value of the functions passed through while ensuring arguments are properly passed.

We ask you to write the following functions:

• justInvoke(fn): The function simply invokes the function passed through to it. It also returns the return value of the passed through function.
• setThisWithCall(fn, thisValue, arg): The function again invokes the function passed to it, but uses the call method to return the function's this value. (Make sure to correctly pass the third argument!)
• setThisWithApply(fn, thisValue, args): Again, invoke the function passed to it, change the this value of that function passed to it. In addition, we ask you to invoked the passed function with arguments. You should accomplish all of the above by using apply.
• returnNewFunctionOf(functionToBeCopied, thisValue): Here, we ask you to write a function that returns a copy of the function passed through, but sets the this value of the function's copy.

View Javascript Bind, Call and Apply Lab on Learn.co and start learning to code for free.

Don't forget to make use of MDN's call and apply documentation!

MDN Call

MDN Apply