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Conditional Statements

Beginner
70 XP
25 min
Lesson Content

Conditional Statements

Conditional statements allow your code to make decisions and execute different code based on conditions. They're essential for creating interactive and dynamic programs.

If Statement

if (condition) {
  // code runs if condition is true
}

If-Else

if (condition) {
  // code if true
} else {
  // code if false
}

If-Else If-Else

if (score >= 90) {
  grade = 'A';
} else if (score >= 80) {
  grade = 'B';
} else if (score >= 70) {
  grade = 'C';
} else {
  grade = 'F';
}

Ternary Operator

let result = condition ? valueIfTrue : valueIfFalse;
let status = age >= 18 ? 'Adult' : 'Minor';
Example Code

Create a program that assigns grades based on score

let score = 82;
let grade;

if (score >= 90) {
  grade = 'A';
} else if (score >= 80) {
  grade = 'B';
} else if (score >= 70) {
  grade = 'C';
} else if (score >= 60) {
  grade = 'D';
} else {
  grade = 'F';
}

console.log('Score:', score);
console.log('Grade:', grade);

Expected Output:

Score: 82
Grade: B
Study Tips
  • •Read the theory content thoroughly before practicing
  • •Review the example code to understand key concepts
  • •Proceed to the Practice tab when you're ready to code