Getting TypeError: Amount must be an integer on test value 315.15

[sofiaguyang]

The code snippet below throws Getting TypeError: Amount must be an integer

import MoneyLib = require('js-money');

MoneyLib.fromDecimal(300.15, 'PHP');

This line appears to be causing the problem:

js-money/lib/money.js

Line 119 in 10a4870

var resultAmount = amount * precisionMultiplier;

The result produced is 30014.999999999996 which is not the integer that's expected.

[MaxPRafferty]

Can also reproduce with new Money(34.98, currency). Will occur in any value in which n * 100 cannot be precisely held by JS float representation.
bad solution: next line, resultAmount = Math.ceil(resultAmount);
good solution: do math with an appropriately precise decimal library: https://github.com/MikeMcl/decimal.js/

[gitowiec]

Just give your money in cents/pennies eg:

import MoneyLib = require('js-money');

MoneyLib.fromDecimal(30015, 'PHP');

[therealadamsimkins]

The Money.fromDecimal function allows you to pass a third parameter of "rounder" which should be one of Math.ceil, Math.floor, or Math.round. You can then create your Money object without error like so:
Money.fromDecimal(300.15, Money.PHP, Math.round);

[reestolonio]

@mothman103182 Passing a "rounder" function just burdens the application using it. You just remove the issue in the library and let application handles it. Why not use big decimal instead for precise numeric operations?