I'd like to round at most 2 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?...

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Is there a mature library for doing decimal-based math, possibly arbitrary-precision, in JavaScript?  Edit: I want this information for a reference page on floating-point-related problems and alternatives to use when binary floating-point is inappr...

I have float numbers like 3.2 and 1.6.  I need to separate the number into the integer and decimal part. For example, a value of 3.2 would be split into two numbers, i.e. 3 and 0.2  Getting the integer portion is easy:  n = Math.floor(n);   But I a...

I need regex to validate a number that could contain thousand separators or decimals using javascript. Max value being 9,999,999.99 Min value 0.01 Other valid values: 11,111 11.1 1,111.11  INVALID values: 1111 1111,11 ,111 111,  I've searched a...

I just read on MDN that one of the quirks of JS's handling of numbers due to everything being "double-precision 64-bit format IEEE 754 values" is that when you do something like .2 + .1 you get 0.30000000000000004 (that's what the a...

I'm facing the following issue/behavior:  console.log(1234567892012.123456);   // 1234567892012.1234 console.log(12345678920123.123456);  // 12345678920123.123 console.log(123456789201234.123456); // 123456789201234.12   What is causing this? Are...

Requirement:   Convert input integer or decimal to an array and convert array of integers which may include a decimal to a number.  Restriction:   Do not use string methods or convert input or output to a string during the procedure (a self-imposed r...

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I am trying to convert a decimal value back to an RGB value.  Assuming that this is the formula for compiling the decimal value  c = r*(255*255)+g*255+b   (For example rgb(16,120,78) adds up to 1071078)  How would one solve r, g and b without any ...