num

num is an arbitrary size fixed precision library written in javascript for node.js and browsers

Looking for just integers? Check out int

npm install num

var num = require('num');
 
// ordinary js floating point math
console.log(0.1 + 0.2); // 0.30000000000000004 :(
 
// with `num`
console.log(num(0.1).add(0.2).toString()); //'0.3'

api

Besides the num function, all of the other methods operate on the objects returned by num

num (value)

construct a new decimal

valid values are integers, numbers, or strings

add (value)

add {value} to our number and return a new num

sub (value)

subtract {value} from our number and return a new num

mul (value)

multiply our num by {value} and return a new num

div (value)

divide our num by {value} and return a new num

// note that `div` uses the precision of the numerator
num('1').div('3.0') -> 0
num('1.0').div('3') -> 0.3

neg

return a new num that is the negative

abs

return new num that is the absolute value

abs

return a new num that is the absolute value

cmp (value)

compare our value to {value}

return 0 if self and value are equal, -1 if self < value, 1 if self > value

lt (value)

return true if self < value

lte (value)

return true if self <= value

gt (value)

return true if self > value

gte (value)

return true if self >= value

eq (value)

return true if self == value

ne (value)

return true if self != value

set_precision (precision)

set the precision for the number. Can be used to alter how many places after the decimal are relevant.

return self