Dashboard/JavaScript Basics/variables

Module 1 of 10

variables

Declare variables, assign values, and use const, let, and typeof.

JavaScript Basics · 0/12 completed · scroll down for every challenge

Challenge 1 of 12

Create a string variable

Instructions

Create a variable named `name` and assign it the string `"Ada"`.

Editor

IntelliSense on

// Write your code below

Challenge 2 of 12 · Add two numbers

Challenge 2 of 12

Add two numbers

Instructions

Create variables `a` and `b` with values 12 and 30. Create `sum` with their total.

Editor

IntelliSense on

// Write your code below

Challenge 3 of 12 · Reassign with let

Challenge 3 of 12

Reassign with let

Instructions

Use `let` for `score`, start at 0, then set it to 100.

Editor

IntelliSense on

// Write your code below

Challenge 4 of 12 · Increment a counter

Challenge 4 of 12

Increment a counter

Instructions

Start `count` at 5 with `let`, then increment it by 1 using `++`.

Editor

IntelliSense on

// Write your code below

Challenge 5 of 12 · Combine strings

Challenge 5 of 12

Combine strings

Instructions

Given `first` and `last`, create `fullName` as `"Ada Lovelace"` using `+`.

Editor

IntelliSense on

const first = "Ada";
const last = "Lovelace";
// Write your code below

Challenge 6 of 12 · Number variable

Challenge 6 of 12

Number variable

Instructions

Create `year` with the number 2026.

Editor

IntelliSense on

// Write your code below

Challenge 7 of 12 · Boolean variable

Challenge 7 of 12

Boolean variable

Instructions

Create `ready` with the boolean value `true`.

Editor

IntelliSense on

// Write your code below

Challenge 8 of 12 · typeof check

Challenge 8 of 12

typeof check

Instructions

Store `typeof "js"` in `kind`.

Editor

IntelliSense on

// Write your code below

Challenge 9 of 12 · Undefined value

Challenge 9 of 12

Undefined value

Instructions

Create `pending` without assigning a value (use `let`).

Editor

IntelliSense on

// Write your code below

Challenge 10 of 12 · Null value

Challenge 10 of 12

Null value

Instructions

Create `empty` and set it to `null`.

Editor

IntelliSense on

// Write your code below

Challenge 11 of 12 · Swap with a temp

Challenge 11 of 12

Swap with a temp

Instructions

Swap `left` and `right` using a temporary variable.

Editor

IntelliSense on

let left = 3;
let right = 9;
// Write your code below

Challenge 12 of 12 · Template from parts

Challenge 12 of 12

Template from parts

Instructions

Build `label` as `"JS-101"` from `lang` and `code` using a template literal.

Editor

IntelliSense on

const lang = "JS";
const code = 101;
// Write your code below

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