Functions and Conditionals
⚡ JavaScriptWrite functions and use if/else to make decisions.
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Functions and Conditionals
Functions
// Function declaration
function greet(name) {
return "Hello, " + name + "!";
}
// Arrow function
const add = (a, b) => a + b;
console.log(greet("Alice")); // "Hello, Alice!"
console.log(add(3, 5)); // 8If/Else
let score = 75;
if (score >= 90) {
console.log("Excellent!");
} else if (score >= 70) {
console.log("Good job!");
} else if (score >= 50) {
console.log("You passed.");
} else {
console.log("Keep trying.");
}Example
// Function to calculate grade
function getGrade(score) {
if (score >= 90) return "A";
if (score >= 80) return "B";
if (score >= 70) return "C";
if (score >= 60) return "D";
return "F";
}
// Test it
let scores = [95, 82, 67, 55, 73];
for (let s of scores) {
console.log("Score " + s + " = Grade " + getGrade(s));
}
// Function to check if number is even or odd
function evenOrOdd(n) {
return n % 2 === 0 ? "even" : "odd";
}
console.log(evenOrOdd(7)); // "odd"
console.log(evenOrOdd(12)); // "even"Exercises
Exercise 1. Write an isEven Function
Medium
Write a function isEven(n) that returns true when n is even and false otherwise.
Use the modulo operator: return n % 2 === 0;
Use the modulo operator: return n % 2 === 0;
function isEven(n) {
}Expected Output
isEven(4) === true, isEven(7) === false.Lesson Nav
Course contents
JavaScript Course
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Exercises
Exercise 1 Write an isEven Function