# WDI-PANTHALASSA
---
Title: Javascript Homework for w01d04
Type: Homework
Duration: "2:00"
Creator:
Original creators: WDI-BLT, WDI-Meeskeeks
Adapted by: Kristyn Bryan
Course: WDIr Panthalassa
Competencies: Javascript
Prerequisites: Basic Javascript
---
# Homework - Javascript Basics
## Setup
Make a file inside your `homework` folder for w01d04 called `app.js`. Write all of your javascript answers in `app.js`, and test them in the bash console using the command `node app.js` from inside the `homework` folder.
Any non-javascript written answers can be made into a comment in your .js file by putting a pound # at the beginning of the line. Or, if you write a comment, you can select the blocks of text and comment them out with this shortcut `command` + `/`.
## Conceptual Questions
1. How do we assign a value to a variable?
2. How do we change the value of a variable?
3. How do we assign an existing variable to a new variable?
4. How do we use a variable within an expression?
**Commit 1**
The commit message should read:
"Answered JS basic conceptual questions"
## Exercises
1. Create a variable called `firstVariable`.
- assign it the value of a string => `"Hello World"`
- change the value of this variable to a number.
- store the value of `firstVariable` into a new variable called `secondVariable`
- change the value of `secondVariable` to a string.
- What is the value of `firstVariable`?
2. Create a variable called `yourName` and set it equal to your name as a string.
- Write an expression that takes the string "Hello, my name is " and the variable `yourName` so that it returns a new string with them concatenated.
*(ex: "Hello, my name is Jean Valjean")*
**Commit 2**
The commit message should read:
"Completed JS basic exercises"
...
# Javascript Data Types (Primitives)
## Conceptual Questions
1. Name 4 different built in data types (primitives) in Javascript.
2. What is the difference between an integer and a float?
4. How do you create an empty array and store it in a variable?
**Commit 3**
The commit message should read:
"Answered JS data type questions"
## Exercises
1. Given the following array `var a = [1, 10, "Hello", true]`
- how do you access the 1st element in the array?
- Change the value of `"Hello"` to `"World"`.
- Check the value of `a` to make sure it updated the array.
2. Given the following array `["Panthalassa", "Zoom", "Cloud9", "Github"]`
- What would you write to access the 3rd element of the array?
- Change the value of "Github" to "Octocat"
- Add a new element, "Cloud City" to the array.
3. Create a string that contains quotes and store it in a variable.
4. What is the result from the expression `"World" * 5`. Why?
**Commit 4**
The commit message should read:
"Completed JS data type exercises"
# JavaScript - Primitive Methods & Properties
## Conceptual Questions
1. List at least 5 properties built into a string.
2. List at least 2 method examples built into an array.
**Commit 5**
The commit message should read:
"Answered JS method & properties questions"
## Exercises
1. Given the following string `"The Peculiar Purple Pieman of Porcupine Peak"`
- How can we check the length of this string?
3. Given the following array `[5,10,500,20]`
- using the `push` method, add the string `"Egon"` to the end of the array.
- using a different method, remove the string from the end of the array.
- using the `unshift` method, add the string `"Bob Marley"` to the beginning of the array
- using a different method, remove the string from the beginning of the array
**Commit 6**
The commit message should read:
"Completed JS method & properties exercises"
...
# Javascript - operators
## Exercises
#### 1.
Using the provided variable definitions, replace the blanks with a mathematical or boolean operator that evaluates the expression to true. :wave:
```
var a = 4;
var b = 53;
var c = 57;
var d = 16;
var e = 'Kevin';
```
- a _ b;
- c _ d;
- 'Name' ___ 'Name';
- a _ b ___ c;
- a _ a ___ d;
- e ___ 'Kevin';
- 48 ___ '48';
...
**Commit 7**
The commit message should read:
"Completed JS operator exercises"