The actual one-liner is 'Math.round (number)'. The whole type casting business is unnecessary. In JavaScript strings are automatically coerced to numbers when needed.

I'd like to round at most two decimal places, but only if necessary. Input: 10 1.7777777 9.1 Output: 10 1.78 9.1 How can I do this in JavaScript?

possible duplicate of round number in JavaScript to N decimal places -- please use the search before you ask a new question.

I have the following JavaScript syntax: var discount = Math.round(100 - (price / listprice) * 100); This rounds up to the whole number. How can I return the result with two decimal places?

Can you round a number in JavaScript to one character after the decimal point (properly rounded)? I tried the *10, round, /10, but it leaves two decimals at the end of the int.

This works great, but the OP asked how to round up a number, so Math.ceil should be used here instead of Math.round.

It returns a string, not a number. So it doesn't round a number to N decimals, it creates a string that humans can read as a number with decimals. But ony if they, by accident, use the same sign for …

288 How can I round down a number in JavaScript? math.round() doesn't work because it rounds it to the nearest decimal. I'm not sure if there is a better way of doing it other than breaking it apart at the …

277 Number.prototype.toFixed is a function designed to format a number before printing it out. It's from the family of toString, toExponential and toPrecision. To round a number, you would do this:

May 26, 2011 · 34 For the most accurate rounding, create this function and use it to round to 2 decimal places: