Today I learned-JavaScript: while Loops, Arrow Functions, and the map() Method

1.Looping with while

The while loop continues executing a block of code as long as a condition is true.

Syntax:

let i = 0;
while (i < 5) {
  console.log(i);
  i++;
}

Notes:

Be careful to increment the counter (i++), or you might create an infinite loop.

Use while when you don't know ahead of time how many times you'll loop.

2.Arrow Functions

Arrow functions are a shorter syntax for writing functions. They're especially useful for small functions or callbacks.
Syntax:

// Regular function
function add(a, b) {
  return a + b;
}

// Arrow function
const add = (a, b) => a + b;

Key Features:

Short and clean syntax.

Does not have its own this (inherits from parent scope).

Great for array methods like map, filter, forEach, etc.

3.map() Method

The map() method creates a new array by applying a function to each element in an existing array.
Syntax:

const numbers = [1, 2, 3];
const doubled = numbers.map(num => num * 2);
console.log(doubled); // [2, 4, 6]

Notes:

map() does not modify the original array.

The returned array will have the same length as the original.

Example: Combining All Three

let nums = [1, 2, 3, 4, 5];
let i = 0;

while (i < nums.length) {
  nums[i] += 1;
  i++;
}

const doubled = nums.map(n => n * 2);
console.log(doubled); // [4, 6, 8, 10, 12]