Array Methods

1. Converting to String

• toString(): Converts an array to a string of comma separated values.
• join(separator): Joins all elements into a string with a specified separator.

2. Adding & Removing Elements

• pop(): Removes the last element.
• push(): Adds a new element at the end.
• shift(): Removes the first element (and "shifts" all other elements to a lower index).
• unshift(): Adds a new element at the beginning.

const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.pop();              // Removes "Mango"
fruits.push("Kiwi");       // Adds "Kiwi"
fruits.shift();            // Removes "Banana"
fruits.unshift("Lemon");   // Adds "Lemon"

3. Splicing & Slicing

• splice(): Used to add new items to an array (can also remove).
• slice(): Slices out a piece of an array into a new array.

fruits.splice(2, 0, "Lemon", "Kiwi"); // At position 2, remove 0, add items
const citrus = fruits.slice(1); // New array starting from index 1

4. Merging

• concat(): Creates a new array by merging (concatenating) existing arrays.

const myGirls = ["Cecilie", "Lone"];
const myBoys = ["Emil", "Tobias", "Linus"];
const myChildren = myGirls.concat(myBoys);

Destructive vs Non-Destructive

• pop, push, splice, sort change the original array (Destructive).
• concat, slice return a new array (Non-Destructive).