reading-notes

JavaScript Functions & Operations

Functions

• Pieces of code that perform a specific functions/actions.
• Can be called/executed/invoked multiple times throughout code
• To call a function by using its name followed by parentheses “()”. If the function takes any arguments, you can pass them inside the parentheses separated by commas.

Example:

function addNumbers(num1, num2) { return num1 + num2; }

Note: Arguments are typed inside the brackets

• To use functions they must be called

  Example:

  let sum = addNumbers(5, 10); console.log(sum); //

  Output: 15

Operations

Operations are performed on values.

Examples

• Arithmetic Operations:

let x = 5 + 3; // addition

let y = 10 - 4; // subtraction

let z = 2 * 6; // multiplication

let w = 12 / 4; // division

let r = 17 % 3; // modulus (remainder)

• Comparison Operations: compare values and retures a boolean (true/false) result

let a = 10; let b = 5;

console.log(a == b); Output: false console.log(a > b); Output: true console.log(a <= 10); Output: true

-Logical Operations: Used to combine boolean values and return a boolean result

let hasMoney = true;

let isHungry = false;

console.log(hasMoney && isHungry); Output: false

console.log(hasMoney || isHungry); Output: true console.log(!hasMoney); Output: false

-Assignment operations: used to assign values to variables.

let c = 10;

c += 5; // equivalent to c = c + 5

console.log(c); // 15