JS-Basics for Dev League Prep

Getting Started

1. Fork this repository
2. clone this repo from your personal GitHub account.
   • Copy the SSH address on the page
   • Run the command: $ git clone [YOUR SSH ADDRESS] to clone this repo onto your computer.
3. Navigate into the exercise folder, e.g. $ cd prep-js-basics.
4. Run the command: $ npm install to get all other files needed to run the tests.
5. Your work will be entered into the file named index.js
6. Run your tests with the command $ npm test.

• You will need to enter this command each time you want to run the tests.

Exercises

1. Variables with a String as their value

Declare variables named firstName, lastName, and birthPlace. Fill out the values for these with your own data or make it up. It should be a String.

1. Variables with a Number as their value

Declare variables named favoriteNumber, currentYear, and thatOnePrinceSong. Their values should be a Number.

1. Variables with Boolean values

Declare variables named isDaytime, isLeftHanded, inHawaii, and isHappyCoding. Their values should be a Boolean.

1. Variables with null

Declare variables named enrolledAtDevLeague and completedFridayPrep. Their values should be a Null value.

1. Variables with an Array for it's value

Declare a variable named westCoast which is an Array. This Array contains the names of all the states which can be found along the west coast of The United States.

1. Variables with an Array for it's value

Declare a variable named evenNumbers which is an Array. This Array contains numbers that are considered 'even values'. Have at least ten even values in this array.

1. Variables with the outcome of an arithmetic operation

Declare a variable named sumOfNumbers which is a Number. This Number contains the result of performing an arithmetic operation on two numbers. Have this variable store the result of adding 3 numbers of your choosing. Extend this behavior to include subtraction, multiplication and division.

1. Variables with the outcome of a comparison operation

Declare a variable named isEqual which is a Boolean. This Boolean contains the result of performing a comparison to test if two strings are equal. We want to compare the two strings "Tacocat" and "tacocat" and console.log() the result.

Note: There is no test which tests your console.log()'s output'. Also, there are zero tests for the BONUS below.

Bonus: See if you can come up with a few examples of double comparison operator(==) vs triple comparison operator(===).

1. Variables with the outcome of an assignment operation

Declare a variable named generalContainer. This variable will be used to store multiple types of values as we assign them to show how variables in JavaScript are not bound to a single data type and can change values.

Write 5 different assignment statements and console.log() the value of the variable after each assignment statement to show the current value.

note: The tests for this section cannot test your variable as it changes, it can only test that you declared the variable by giving it the right name.

1. Declare Functions: jump

Declare a Function named jump which takes a single argument, height. This function should return a String, "You jumped 9 feet high!" if invoked in this way, jump(9)

Store the return value to a variable named jumpResult and use console.log to inspect the value which was returned by your function.

1. Declare Functions: cook

Declare a Function named cook which a takes three arguments/parameters, ingredient1, ingredient2, recipeName.

This function should return a String along the lines of, "Tomatoes and Cheese make a Pizza!" if invoked in this way, cook("Tomatoes", "Cheese", "Pizza");

Testing your work

Use the command $ npm test to run tests which will validate your work.

References

• slides