Programming Fundamentals: Variables

Learning Objectives

• Understand how to use the different Javascript variable types
  • MDN Javascript Variables
    • const
    • let

Introduction

In this exercise you will learn how to declare and use Javascript variables

Setup

• Fork this repository and clone your forked version to your machine

• Install dependencies by running the command below while in the project's root directory:

  npm ci

Instructions

• Read through the numbered comments in the following files to understand the requirements of this exercise.

  • src/declaration.js
  • src/assignment.js

• Write your code directly below the numbered comment.

• Add console.log()s to get visibility on your solution and run the file with the command node src/<file>.js etc

• See src/example.js for some examples

Running Tests

Functional Tests

• To verify your solutions, run the test suite by running the npx jasmine command followed by the path to the corresponding test file for each src/*.js file above, eg:

  npx jasmine spec/declaration.spec.js

• Alternatively, run:

  npm test

• To begin with, almost all of the tests will fail - example tests, if they exist, will pass with a green . You'll see many red Fs in your console, like the image below:

  

• Your solution is complete when the all the red Fs have been replaced with green .s in your console, as shown below:

  

Formatting Tests

When you try to git commit any work you've staged using git add, there is an additional test that runs that checks the formatting of your work against a set of rules we've defined. To run these tests locally use the following:

$ npx eslint src

You will then need to resolve the errors before successfully committing your work. You can also do this automatically with this command - but try to understand what well-formatted code looks like so you don't simply rely on this magic fix!

$ npx eslint src --fix

NB: If you fix these formatting errors, don't forget to git add and then git commit your changes before git push back to your remote repository

Extensions

• Extension exercises can be found in the src/extensions directory with corresponding tests in the spec/extensions directory.

• To run the tests for the extensions, you can either run spec files individually as follows:

  npx jasmine spec/extensions/<file>.spec.js

• Alternatively, run:

  npm run test-extensions