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Values, Types & Operators

Practice reading JS code and understanding what it does!

Learning Objectives

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

Prerequisites

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

Getting Started

  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

Instructions

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.

Problem One

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

17
// number, 17
1 + 2 * 3 + 4
// number, 11
800 / 80 / 8
// number, 1.25
400 > 200
// boolean, true
1 !== 1
// boolean, false 
true || false
// boolean, true
true && false
// boolean, false
20 % 6
// number, 2
"a" + "b"
// string, "ab"

Problem Two

What will the following return?

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

Problem Three

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 A && B A ll B
true true true // true
false true false // true
true false false // true
false false false // false

Problem Four

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
true true false false // false
false true false false // false
true false true true // false
false false true false // true

Problem Five

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

Problem Six

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

//```js 2 + 3 * 2 + 1 2 + 6 + 1 8 + 1 9

## Problem Seven

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

// ```js
4/2 + 8/4 
2 + 2
4 

Problem Eight

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

// 'ca' + 'ter' + 'pi' + 'llar' 'cater'+ 'pillar' 'caterpillar'

Problem Nine

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

// 2 * 4 === 8 && 'car' + 'pool' === 'carpool' 8 (truthy) && 'carpool' (truthy) (carpool 2nd truthy evaluated) 'carpool'

Problem Ten

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

// '1' + '2' + '3' - '1' '12' + '2' '122'

values_types_operators_assignment's People

Contributors

coreyladovsky avatar benstone1 avatar jamee-maker avatar alejo4373 avatar jabyess avatar xpectro93 avatar

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