3-scopes

Part III: Scopes

Note: Before getting started on these exercises, please be certain that you've read through the root README.md file in this repository.

To complete these exercises, you will need to download this repo and open this particular folder in a code editor.

Exercises

It is your mission to go through the function.js file and change all the '???' in such a way that all the tests pass true.

Run the specrunner.html file in a web browser. This document will immediately show one passed test and a series of failing tests.

The functions.js file holds all the failing tests that are being displayed in SpecRunner.html. You will be editing the functions.js file and refreshing the SpecRunner.html to check your progress on making the tests pass. This is a regular JavaScript file, so note that you can use console.log to help debug and inspect these functions.

A test block starts with an it function. The it function takes two arguments. The first one is a statement describing the rule addressed by the test. The second is a function that will either evaluate to true or false using the expect function. The expect statement (expect(ACTUAL === 'inner').to.be.true;) will evaluate if the statement between the parens ACTUAL === 'inner' is true. You can almost read it like plain English. The expect statement below "expects that the variable ACTUAL equals the value 'inner' to be true".

Failing Test Example

it('a function has access to its own local scope variables',

function () {
  var fn = function () {
    var name = 'inner';
    ACTUAL = name;
  };
  fn();
  expect(ACTUAL === '???').to.be.true;
  // change '???' to what you believe ACTUAL will evaluate to.
});

Passing Test Example

it('a function has access to its own local scope variables',

function () {
  var fn = function () {
    var name = 'inner';
    ACTUAL = name;
  };
  fn();
  expect(ACTUAL === 'inner').to.be.true;
  // Here we changed '???' to 'inner'
  // (because we assigned ACTUAL, a global variable, to equal the value of name inside fn)
});

Don't forget..

You should thoroughly read all of code in front of you and aim to understand line-by-line what is happening.