Some more Array Methods in JavaScript

 let num = [1, 2, 3, 4, 5, 6, 7, 8, 9];

let num_more = [11, 12, 13, 14, 15, 16, 17, 18, 19];

let num_even_more = [211, 212, 213, 214, 415, 416, 417, 418, 419];

console.log(num.length);

delete num[0];  //"delete" is a Operator(just like "typeof" operator), Not method

console.log(num.length);

let newArray = num.concat(num_more, num_even_more);

console.log(newArray);

let numTwo = [551, 22, 3, 14, 5, 6, 7, 8, 229];

numTwo.sort();  //sort() method is used to sort an array alphabetically

console.log(numTwo);

// sorting in Ascending Order

let compare = (a, b) => {

    return a - b;

}

numTwo.sort(compare);

console.log(numTwo);

// sorting in Descending Order

let compareTwo = (a, b) => {

    return b - a;

}

numTwo.sort(compareTwo);

console.log(numTwo);

let numThree = [551, 22, 3, 14, 5, 6, 7, 8, 229];

console.log(numThree.reverse());

//Splice and Slice

//Splice can be used to add new items to an array

let numFour = [551, 22, 3, 14, 5, 6, 7, 8, 229];

//Syntax: numFour.splice(position to add, No of elements to remove, Elements to be added);

numFour.splice(2, 3, 1021, 1022, 1023);

console.log(numFour);

//ArrayName.splice() returns deleted items and modifies the Array

let deletedValues = numFour.splice(2, 3, 1021, 1022, 1023);

console.log(deletedValues, typeof deletedValues);

//slice() : slices out a piece from an array. It creates a new Array

let numFive = [551, 22, 3, 14, 5, 6, 7, 8, 229];

let newNum = numFive.slice(3);

console.log(newNum);

let newNumTwo = numFive.slice(3, 6);    //Here Last "6th" index value will not include

console.log(newNumTwo);

OUTPUT :

9 9 [ <1 empty item>, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 211, 212, 213, 214, 415, 416, 417, 418, 419 ] [ 14, 22, 229, 3, 5, 551, 6, 7, 8 ] [ 3, 5, 6, 7, 8, 14, 22, 229, 551 ] [ 551, 229, 22, 14, 8, 7, 6, 5, 3 ] [ 229, 8, 7, 6, 5, 14, 3, 22, 551 ] [ 551, 22, 1021, 1022, 1023, 6, 7, 8, 229 ] [ 1021, 1022, 1023 ] object [ 14, 5, 6, 7, 8, 229 ] [ 14, 5, 6 ]