Day 8 : Today I Learned Array Map, While Loop, and Arrow Functions in JavaScript

Today I spent some time exploring three important JavaScript concepts: array map, while loop, and arrow functions. Here’s a quick summary of what I learned.

Array Map

The map() method creates a new array by applying a function to every element in an existing array. It’s super useful when you want to transform data without modifying the original array.

Example:

const numbers = [1, 2, 3, 4];
const doubled = numbers.map(num => num * 2);
console.log(doubled); // [2, 4, 6, 8]

In this example, map() takes each number and multiplies it by 2, returning a new array with the doubled values.

While Loop

A while loop repeatedly executes a block of code as long as a specified condition is true. It’s handy when you don’t know beforehand how many times the loop should run.

Example:

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

This will print numbers from 0 to 4. The loop keeps running until count is no longer less than 5.

Arrow Functions

Arrow functions are a concise way to write functions in JavaScript. They use the => syntax and often make your code cleaner and easier to read.

Example:

const greet = name => `Hello, ${name}!`;
console.log(greet('Alice')); // Hello, Alice!

Arrow functions also have different behavior with this, which can be useful in some cases.