Question

6.15 LAB: JavaScript arrays

Write the function divideArray() in script.js that has a single numbers parameter containing an array of integers. The function should divide numbers into two arrays, evenNums for even numbers and oddNums for odd numbers. Then the function should sort the two arrays and output the array values to the console.

Ex: The function call:

var nums = [4, 2, 9, 1, 8];
divideArray(nums);

produces the console output:

Even numbers:
2
4
8
Odd numbers:
1
9

The program should output "None" if no even numbers exist or no odd numbers exist.

Ex: The function call:

var nums = [4, 2, 8];
divideArray(nums);

produces the console output:

Even numbers:
2
4
8
Odd numbers:
None

Hints: Use the push() method to add numbers to the evenNums and oddNums arrays. Supply the array sort() method a comparison function for sorting numbers correctly.

To test your code in your web browser, call divideArray() from the JavaScript console.

Answer 1

script.js :

//function divideArray()

        function divideArray(nums) {

            //declaring array to store oddNumber

            var oddArray = [];

            //this is the array which stores even number

            var evenArray = [];

            //using for loop

            for (var i = 0; i < nums.length; i++) {

                //checking value of i

                if (nums[i] % 2 == 0) {

                    //when even number is found then

                    //push element into even array

                    evenArray.push(nums[i]);

                }

                else {

                    //when odd number is found then

                    //push element into odd array

                    oddArray.push(nums[i]);

                }

            }

            //test the odd and even array

            evenArray.sort();

            oddArray.sort();

            //print even numbers

            console.log("Even numbers:");

            //checking array length

            if (evenArray.length > 0) {

                //when evenArray conatins elements then

                //print even numbers

                //using for loop

                for (var i = 0; i < evenArray.length; i++) {

                    console.log(evenArray[i]);//print element

                }

            }

            else {

                //when evenArray has no any element then print

                console.log("None");

            }

            //print odd numbers

            console.log("Odd numbers:");

            //checking array length

            if (oddArray.length > 0) {

                //when oddArray conatins elements then

                //print odd numbers

                //using for loop

                for (var i = 0; i < oddArray.length; i++) {

                    console.log(oddArray[i]);//print element

                }

            }

            else {

                //when oddArray has no any element then print

                console.log("None");

            }

        }

        //declare array with numbers

        var nums = [4, 2, 9, 1, 8];

        //call function divideArray()

        divideArray(nums);

======================================

Screen when function is called with array  [4, 2, 9, 1, 8] :

Screen when function is called with array  [4, 2, 8] :