4. JavaScript Operators and Expressions

Operators:

1. Arithmetic Operators:

• Addition (+): Adds two values.

• Subtraction (-): Subtracts the right operand from the left operand.

• Multiplication (*): Multiplies two values.

• Division (/): Divides the left operand by the right operand.

• Modulus (%): Returns the remainder of a division.

let a = 10;
let b = 5;
let sum = a + b;    // 15
let difference = a - b;   // 5
let product = a * b;      // 50
let quotient = a / b;     // 2
let remainder = a % b;    // 0

2. Comparison Operators:

• Equal to (== or ===): Checks if two values are equal.

• Not equal to (!= or !==): Checks if two values are not equal.

• Greater than (>): Checks if the left operand is greater than the right operand.

• Less than (<): Checks if the left operand is less than the right operand.

• Greater than or equal to (>=): Checks if the left operand is greater than or equal to the right operand.

• Less than or equal to (<=): Checks if the left operand is less than or equal to the right operand.

let x = 5;
let y = 10;

console.log(x === y);   // false
console.log(x !== y);   // true
console.log(x > y);     // false
console.log(x < y);     // true

3. Logical Operators:

• Logical AND (&&): Returns true if both operands are true.

• Logical OR (||): Returns true if at least one operand is true.

• Logical NOT (!): Returns true if the operand is false, and vice versa.

let isTrue = true;
let isFalse = false;

console.log(isTrue && isFalse);   // false
console.log(isTrue || isFalse);   // true
console.log(!isTrue);             // false

4. Assignment Operators:

• Assignment (=): Assigns a value to a variable.

• Add and assign (+=), Subtract and assign (-=), Multiply and assign (*=), Divide and assign (/=): Combine arithmetic operation with assignment.

let a = 5;
a += 3;  // equivalent to a = a + 3;   // 8