For Loop

Definition: A for loop repeats a block of code a specific number of times, usually when you know how many times you want it to run.

How it works: It runs the initialization once, checks the condition each time, runs the code if the condition is true, and updates the counter after each run.

for (let i = 0; i <= 10; i++) {
  console.log(`Hello ${i}`);
}

Output:

While Loop

Definition: A while loop runs a block of code as long as a specified condition is true, often used when you don't know how many times it should run.

How it works: It checks the condition before each run and keeps looping until the condition becomes false or a break statement stops it.

let number = 0;
while (true) {
  console.log(`Hello ${number}`);
  number++;
  if (number >= 10) {
    break;
  }
}

Output:

Function Declaration

function greet(name) {
  console.log(`Hello, ${name}!`);
}

greet("Justin");

Output:

Arrow Function

const add = (a, b) => {
  return a + b;
};

console.log(add(5, 3));

Output:

Basic Variable Declaration

let name = "JavaScript";
let version = 2023;
console.log("Language:", name);
console.log("Version:", version);
        

Output:

const vs let

const pi = 3.14;
let counter = 0;
        

Explanation: