var original = ['hello', 'there', 'i', 'am', 'Manish']

var copy1 = original.slice(0);
var copy2 = [...original]

var deepCopy = [["firstArray", ["innerArray"]]]
var shallowCopy = deepCopy[0]
//shallowCopy[0] = "hello"
//console.log(shallowCopy[0]);

var allCopy = JSON.parse(JSON.stringify(deepCopy))

allCopy[0].push("addOne")

let deepCopyMap = deepCopy.map(x => x);

//console.log(deepCopy);
//console.log(deepCopyMap);

const nested = [[1, 2, 3], [4, 5, 6], [7, 8, 9]];

flat = nested.flat()

console.log(nested)
console.log(flat)