7-Conditional statements

• 1. Conditional Statements in JavaScript
  • [[#1. Conditional Statements in JavaScript#Definition:|Definition:]]
  • [[#1. Conditional Statements in JavaScript#a. if Statement|a. if Statement]]
  • [[#1. Conditional Statements in JavaScript#b. if...else Statement|b. if...else Statement]]
  • [[#1. Conditional Statements in JavaScript#c. if...else if...else Ladder|c. if...else if...else Ladder]]
  • [[#1. Conditional Statements in JavaScript#d. Ternary Operator (? :)|d. Ternary Operator (? :)]]
  • [[#1. Conditional Statements in JavaScript#e. switch Statement|e. switch Statement]]
• 🔁 2. Loops in JavaScript
  • [[#🔁 2. Loops in JavaScript#Definition:|Definition:]]
  • [[#🔁 2. Loops in JavaScript#a. for Loop|a. for Loop]]
  • [[#🔁 2. Loops in JavaScript#b. while Loop|b. while Loop]]
  • [[#🔁 2. Loops in JavaScript#c. do...while Loop|c. do...while Loop]]
  • [[#🔁 2. Loops in JavaScript#d. for...in Loop|d. for...in Loop]]
  • [[#🔁 2. Loops in JavaScript#e. for...of Loop (ES6)|e. for...of Loop (ES6)]]
  • [[#🔁 2. Loops in JavaScript#f. break and continue|f. break and continue]]

1. Conditional Statements in JavaScript

Definition:

Conditional statements are used to make decisions in code. They allow the program to execute different blocks of code based on whether a condition evaluates to true or false.

---

a. if Statement

Syntax:

if (condition) {
  // block of code executed if condition is true
}

Example:

let age = 18;
if (age >= 18) {
  console.log("Eligible to vote");
}

---

b. if...else Statement

Syntax:

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

Example:

let marks = 45;
if (marks >= 50) {
  console.log("Pass");
} else {
  console.log("Fail");
}

---

c. if...else if...else Ladder

Syntax:

if (condition1) {
  // block 1
} else if (condition2) {
  // block 2
} else {
  // default block
}

Example:

let grade = 85;
if (grade >= 90) {
  console.log("A");
} else if (grade >= 80) {
  console.log("B");
} else {
  console.log("C or below");
}

---

d. Ternary Operator (? :)

A shorthand for if...else. Returns a value based on a condition.

Syntax:

condition ? valueIfTrue : valueIfFalse

Example:

let access = age >= 18 ? "Allowed" : "Denied";

---

e. switch Statement

Used for multiple condition checking. Works well with discrete values.

Syntax:

switch (expression) {
  case value1:
    // block
    break;
  case value2:
    // block
    break;
  default:
    // default block
}

Example:

let day = 2;
switch (day) {
  case 1: console.log("Monday"); break;
  case 2: console.log("Tuesday"); break;
  default: console.log("Another day");
}

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