split not working

Question

How do i split decimal numbers? The variable bidnumber is 10.70.

var bidnumber = $(this).parent(\'div\').siblings(\'.advert-details         


        

Answer 1

• The attribute value is already a string, so you don't have to convert it to a string.
• The split method doesn't put the array back in the variable.
• The substr method doesn't put the new string back in the variable.

So:

bidnumber = bidnumber.split('.');
var first = bidnumber[0];
var second = bidnumber[1];
second = second.substr(0, 1);
var finalnumber = first + '.' + second;

Or just:

bidnumber = bidnumber.split('.');
bidnumber[1] = bidnumber[1].substr(0, 1);
var finalnumber = bidnumber.join('.');

Consider also to parse the string to a number and round it:

var finalnumber = Math.round(parseFloat(bidnumber) * 10) / 10;

Answer 2

You should not use split to break apart the integer and fractional parts of a number.

For example, 10.70 when split (and converting the 70 to cents) would give a different answer to 10.7 even though they're the same number.

var bidnumber = 10.70;     // ignoring your DOM query for now

var whole = ~~bidnumber;   // quick and nasty 'truncate' operator
var cents = 100 * Math.abs(bidnumber - whole);

The final line ensures that the number of cents is positive even if the original number was negative.

The ~~ operator is actually two instances of the ~ operator, which is a bitwise "not" operator that truncates any number to a 32 bit signed value, throwing away any fractional part. Flipping twice gives the original number, but without the fraction.

That's the easiest way to get a "round towards zero" result, as Math.floor() would actually give -11 for an input of -10.70

Answer 3

You forgot to return the array back from split function:

bidnumber = bidnumber.toString().split('.');