Tag Archives: Math

Extend Math.log to allow for bases != e

Posted on by Lea Verou

As Math.log currently stands, it’s a bit useless. It only calculates natural logarithms (base e).  We can easily modify it however, to calculate logarithms of any base: Math.log = (function() { var log = Math.log; return function(n, a) { return log(n)/(a? log(a) : 1); } })(); We can now specify the base as a second [...]

Extend Math.round, Math.ceil and Math.floor to allow for precision

Posted on by Lea Verou

Math.round, Math.ceil and Math.floor are very useful functions. However, when using them, I find myself many times needing to specify a precision level. You don’t always want to round to an integer, you often just want to strip away some of the decimals. We probably all know that if we have a function to round [...]