Round to the nearest .25 javascript

Question

I want to convert all numbers to near .25

So...

5 becomes 5.00 2.25 becomes 2.25 4 becomes 4.00 3.5 becomes 3.50 

thank

Answer 1

Here is what rslite says:

 var number = 5.12345; number = (Math.round(number * 4) / 4).toFixed(2); 

Answer 2

Multiply by 4, round to an integer, divide by 4, and format with two decimal places.

Edit Any reason for downvotes? At the very least, leave a comment to find out what should be improved.

Answer 3

If you need your speed, please note that you can get about a 30% speed improvement using:

 var nearest = 4; var rounded = number + nearest/2 - (number+nearest/2) % nearest; 

On my website: http://phrogz.net/round-to-nearest-via-modulus-division
Performance tests here: http://jsperf.com/round-to-nearest

Answer 4

Here is a common function for rounding. In the above examples, 4 was used because it is inverse to .25. This feature allows the user to ignore this detail. It does not currently support preset accuracy, but can be easily added.

 function roundToNearest(numToRound, numToRoundTo) { numToRoundTo = 1 / (numToRoundTo); return Math.round(numToRound * numToRoundTo) / numToRoundTo; } 

Answer 5

Here is @ Gumbo's answer as a function:

 var roundNearQtr = function(number) { return (Math.round(number * 4) / 4).toFixed(2); }; 

Now you can make calls:

 roundNearQtr(5.12345); // 5.00 roundNearQtr(3.23); // 3.25 roundNearQtr(3.13); // 3.25 roundNearQtr(3.1247); // 3.00 

Answer 6

Very good approximation for rounding:

 function Rounding (number, precision){ var newNumber; var sNumber = number.toString(); var increase = precision + sNumber.length - sNumber.indexOf('.') + 1; if (number < 0) newNumber = (number - 5 * Math.pow(10,-increase)); else newNumber = (number + 5 * Math.pow(10,-increase)); var multiple = Math.pow(10,precision); return Math.round(newNumber * multiple)/multiple; } 

Answer 7

Use the function below, hope it helps

 function roundByQuarter(value) { var inv = 1.0 / 0.25; return Math.round(value * inv) / inv; } 

Calling the function as shown below will result in the closest Quarter value, i.e. it will not return .32, .89, .56, but will only return 0.25, .75, .50 decimal places.

 roundByQuarter(2.74) = 2.75 roundByQuarter(2.34) = 2.25 roundByQuarter(2.94) = 3.00 roundByQuarter(2.24) = 2.25 

Answer 8

 function roundToInc(num, inc) { const diff = num % inc; return diff>inc/2?(num-diff+inc):num-diff; } > roundToInc(233223.2342343, 0.01) 233223.23 > roundToInc(505, 5) 505 > roundToInc(507, 5) 505 > roundToInc(508, 5) 510