Practice Set on Arrays in JavaScript

 //Practice Set on Arrays

//Question 1 : Create an array of numbers and take input from the user to add numbers to this array:

let arr = [1, 2, 3, 4, 5, 6, 7];

let a = prompt("Enter a Number : ");

a = Number.parseInt(a);

arr.push(a);

console.log(arr);

//Question 2 : Keep adding numbers to the array in question 1 until 0 is added to the array.

let arr2 = [1, 2, 3, 4, 5, 6, 7, 83];

let a2;

do {

    a2 = prompt("Enter a Number : ");

    a2 = Number.parseInt(a2);

    arr2.push(a2);

} while (a2 != 0);

console.log(arr2);

//Question 3 : Filter for numbers divisible by 10 from a given array.

let arr3 = [1, 2, 30, 4, 50, 6, 7, 83, 670];

let n = arr3.filter((value) => {

    return value % 10 == 0;

});

console.log(n);

//Question 4 : Create an array of square of given numbers.

let arr4 = [1, 2, 30, 4, 50, 6, 7, 83, 670];

let n4 = arr4.map((value) => {

    return value * value;

});

console.log(n4);

//Question 5 : Use reduce to calculate factorial of a given number from an array of first n natural

//numbers (n being the number whose factorial needs to be calculated)

let arr5 = [1, 2, 3, 4, 5];

let n5 = arr5.reduce((x1, x2) => {

    return x1 * x2;

});

console.log(n5);