Practice reading JS code and understanding what it does!

• Understand different types in javascript
• Practice reading code & understanding boolean logic
• Learn the various operators in javascript and what they do

• Forking & cloning a repo from git
• Making a pull request

1. Fork this repository
2. Clone the forked repository to your computer
3. cd to the cloned directory
4. code . to open the repo in VSCode
5. When you are done, commit and push your work to your forked copy
6. Make a pull request on github against the original repo

For problems 1 and 2, write your answer in a comment (comments start with //) immediately below the line of code.

Example:

2 + 2
// number, 4

For problems 3-5, fill out the existing table or create a new one. See the table syntax guide

For problems 6-10, see the example in problem 6 and write your own answer below each question.

What are the types of the following expressions and what do they evaluate to?

17
// 17 number 

1 + 2 * 3 + 4
// number, evaluates to 11

800 / 80 / 8
// number , 1.25

400 > 200
// boolean , true

1 !== 1
// boolean , true

true || false
// boolean , true

true && false
// boolean , false

20 % 6
// number , 2

"a" + "b"
// string , 'ab'

What will the following return?

typeof 4
// 'number'
typeof "hello"
// 'string'
typeof true
// 'boolean'
2 === 1 || 3 === 4
// false

Create a truth table for the expression A || B.

For reference, here is a truth table for the expression A && B. You can fill out the last column. Don't worry about keeping the spacing exact.

Create a truth table for the expression !A && !B.

For reference, here is a truth table for the expression A && !B. You can fill out the last column. Don't worry about keeping the spacing exact.

| A | B | !B | A && !B | !A && !B | !(A || B) | | ----- | ----- | ----- | ------- | -------- | -------- | | true | true | false | false | false | false | | false | true | false | false | false | false | | true | false | true | true | false | false | | false | false | true | false | true | true |

Create a truth table for the expression !(A || B). | A | B | !B | A && !B | !A && !B | !(A || B)| | ----- | ----- | ----- | ------- | -------- | -------- | | true | true | false | false | false | false | | false | true | false | false | false | false | | true | false | true | true | false | false | | false | false | true | false | true | true |

Write a step-by-step evaluation for the following expression (remember order of operations): 2 + 3 * 2 + 1. For reference, here is a exp of a step-by-step evaluation:

1 + 2 + 3 +4 
3 + 3 + 4
6 + 4
10
// 6 + 2 + 1 
// 8 + 1
// 9
## Problem Seven

Write a step-by-step evaluation for the following expression (remember order of operations): `4 / 2 + 8 / 4`.
// 2 + 8 \ 4
// 2 + 2
// 4 
## Problem Eight

Write a step-by-step evaluation for the following expression: `'ca' + 'ter' + 'pi' + 'llar'`.
// 'cater' + 'pi' + 'llar' 
// 'cater' + 'pillar'

## Problem Nine

Write a step-by-step evaluation for the following expression: `2 * 4 === 8 && 'car' + 'pool' === 'carpool'`.
// 8 === 8 && 'car'  + 'pool' === 'carpool'
// true && 'car' + 'pool' === 'carpool' 
// true && 'carpool' === 'carpool
// true && true 
// true 
carpool

## Problem Ten

Write a step-by-step evaluation for the following expression: `'1' + '2' + '3' - '1'`.
// 123 - 1
// 122