redwolf10105 - 1 year ago 49

Javascript Question

I am creating a program that measures recycling success. It averages to find the answer. This has been making it difficult owing to the fact that 23.456323 doesn't really fit too well in the result box. I put in

`math.round()`

`$('.num').text(prompt('How is recycling? 1-100!'));`

function colors() {

numb = Number($('.num').text());

if (numb < 30) {

$('.num').css('color', '#ff0000');

} else if (numb > 29 && numb < 79) {

$('.num').css('color', '#ffff00');

} else if (numb > 78) {

$('.num').css('color', '#00ff00');

} else {

$('.num').css('color', '#000000');

}

}

colors();

$('button').click(function() {

var how = Number(prompt('How is recycle? Rate it 0-100!'));

var calc = (Number($('.num').text()) + how) / 2;

$('.num').text(calc);

colors();

});

Here is the line that I put the rounding in, with and without the rounding:

`$('.num').text(calc);`

`$('.num').text(math.round(calc));`

Answer Source

JavaScript is case-sensitive; as @Teemu pointed out in the comments, `math`

does not reference the same thing as `Math`

.

Your code references `math`

which has not been defined in your code. Because `math`

is `undefined`

, you should be seeing a error message along the lines of `ReferenceError: math is not defined`

in your browser console.

To fix it change `math`

to `Math`

to reference the `Math`

object, which is implicitly defined as it is part of the language.