Arrays Math Logic JavaScript

Question

I can't seem to list the number of even integers in the array, also I can't get a result when I multiply the array integers by a multiplier. I have been at it for a long time, I can't think anymore. Thanks in advance!

<!DOCTYPE HTML>
<html>

<head>
<meta charset="utf-8">
<title>EvensMultiply</title>
<script type="text/javascript">
    /*Write a defining table and a function named countEvens that counts and returns the number of even integers in an array. The function must have this header: function countEvens(list)*/

    // This function will call and test countEvens() and multiply(list, multiplier).
    function testFunctions() {
        var list = [17, 8, 9, 5, 20];
        var multiplier = 3;
        var result1 = 0;
        var result2 = 0;
        var result3 = 0;
        result1 = countEvens(list);
        //result2 = multiply(list, multiplier);
        result3 = "These are the even numbers of the array list: " + result1 + "<br>" + "This is the array list multiplied by 3: " + result2;
        document.getElementById("outputDiv").innerHTML = result3;
    }
    // This function will find the even intergers in the array.
    function countEvens(list) {
        var evens = [];
        for (var i = 0; i < list.length; ++i) {
            if ((list[i] % 2) === 0) {
                evens.push(list[i]);
                return evens;
            }
        }

    }
    /*Write a defining table and a function to multiply each element in an array by some value. The function must have this header: function multiply(list, multiplier)*/

    // This function will multiply the array list by a multiplier.
    function multiply(list, multiplier) {
        var products;
            products=list.map(function(list){return list * multiplier;});
        return products;
    }
 </script>
 </head>
 <h1>Find evens and multiply by multiplier.</h1>
 <h2>Array list [17, 8, 9, 5, 20]</h2>
 <h3>Click the Compute button to test.</h3>
 <button type="button" onclick="testFunctions()">Compute</button>
 <div id="outputDiv"></div>

 </html>

TbWill4321 · Accepted Answer · 2015-12-10 00:13:27Z

1

You need to return after the loop completes:

// This function will find the even intergers in the array.
function countEvens(list) {
    var evens = [];
    for (var i = 0; i < list.length; ++i) {
        if ((list[i] % 2) === 0) {
            evens.push(list[i]);
        }
    }
    return evens;
}

answered Dec 10, 2015 at 0:13

TbWill4321

8,6863 gold badges30 silver badges25 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Jas · Accepted Answer · 2015-12-10 00:13:50Z

1

Hi Appears a small coding oversight here for counting the even numbers. Your "return evens" is just after pushing the even into the "evens array" so basically you are jumping out of function too early. Please take the below function as modified function, (note the return statement)

function countEvens(list) {
        var evens = [];
        for (var i = 0; i < list.length; ++i) {
            if ((list[i] % 2) === 0) {
                evens.push(list[i]);
            }
        }
        return evens;

    }

answered Dec 10, 2015 at 0:13

Jas

3362 silver badges7 bronze badges

4 Comments

Jas Over a year ago

Uncomment the result2 multiplication statement as well to get the multiply working.

user5500799 Over a year ago

Thanks! I am now getting the other even number. However, I am still getting 0 for the multiplication function.

Jas Over a year ago

Have you uncommented the line "result2 = multiply(list, multiplier);"

user5500799 Over a year ago

Wow! I feel stupid. I have been at this for hours I just can't see clearly anymore. Thanks!

Collectives™ on Stack Overflow

Arrays Math Logic JavaScript

2 Answers 2

Comments

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related