JavaScript Basics
⚡ JavaScriptVariables, data types, and basic operations in JavaScript.
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JavaScript Basics
Variables
Use let and const to store data:
let name = "Alice"; // can change later
const age = 25; // cannot change
let score = 0; // numberData Types
| Type | Example |
|---|---|
| String | "Hello" |
| Number | 42, 3.14 |
| Boolean | true, false |
| Array | [1, 2, 3] |
| Object | {name: "Alice", age: 25} |
Operators
let sum = 5 + 3; // 8
let diff = 10 - 4; // 6
let product = 3 * 7; // 21
let quotient = 15 / 3; // 5
let remainder = 7 % 3; // 1Example
// Variables and data types
let studentName = "Amina";
const school = "King's College";
let grade = 95;
let isPassed = grade >= 50;
console.log("Student: " + studentName);
console.log("School: " + school);
console.log("Grade: " + grade);
console.log("Passed: " + isPassed);
// Arrays
let subjects = ["Math", "English", "Science", "Hausa"];
console.log("Subjects: " + subjects.join(", "));
console.log("Number of subjects: " + subjects.length);Exercises
Exercise 1. Greet a Variable
Easy
Create a variable name with the value "Ada" and log exactly: Hello, Ada!
Use a template literal: console.log(`Hello, ${name}!`)
Use a template literal: console.log(`Hello, ${name}!`)
// your code hereExpected Output
Hello, Ada!