@esmkit/arith

Perform addition, subtraction, multiplication and division operations precisely using javascript

Why

0.1 + 0.2 = 0.30000000000000004
1.0 - 0.9 = 0.09999999999999998
0.105.toFixed(2) = 0.1 // not 0.11

Install

npm install @esmkit/arith --save

Methods

arith.strip(num)         // strip a number to nearest right number
arith.plus(num1, num2, num3, ...)   // addition, num + num2 + num3, two numbers is required at least.
arith.minus(num1, num2, num3, ...)  // subtraction, num1 - num2 - num3
arith.multip(num1, num2, num3, ...)  // multiplication, num1 * num2 * num3
arith.divide(num1, num2, num3, ...) // division, num1 / num2 / num3
arith.round(num, ratio)  // round a number based on ratio

Usage

import arith from "@esmkit/arith";
arith.strip(0.09999999999999998); // = 0.1
arith.plus(0.1, 0.2); // = 0.3, not 0.30000000000000004
arith.plus(2.3, 2.4); // = 4.7, not 4.699999999999999
arith.minus(1.0, 0.9); // = 0.1, not 0.09999999999999998
arith.multip(3, 0.3); // = 0.9, not 0.8999999999999999
arith.multip(0.362, 100); // = 36.2, not 36.199999999999996
arith.divide(1.21, 1.1); // = 1.1, not 1.0999999999999999
arith.round(0.105, 2); // = 0.11, not 0.1

PS: If you want to get rid of XXX is beyond boundary when transfer to integer, the results may not be accurate, use this at the beginning of your app to turn off boundary checking.

arith.enableBoundaryChecking(false); // default param is true

License

MIT