javascript-notes.js

// Remove Duplicate in Array:
[...new Set(arr)];

// Removes the first element from an array
arr.shift();

// Removes the last element fron an array
arr.pop();

// Adds value to the array
arr.unshift("John");

// Ascending Order Numbers in Array:
arr.sort((a, b) => b - a)

// Extracts or Slice the array (starts index 0 then stop in index 2)
arr.slice(0, 2)

// Check if what type. (String, boolean etc.)
typeof array.join(",");

// Output First and Last Value of Array:
const [firstItem, ...rest] = array;