Angular JS's flawed accuracy in subtracting two decimal numbers

Within my AngularJS application, there exists an object containing three distinct amounts. When examining the Chrome browser debugger, I encountered the following information:

The calculation for payment.amountForClosing is derived from subtracting payment.amountReserved from payment.amountRemaining.

The current value of payment.amountRemaining is 3026.2.

Conversely, payment.amountReserved currently holds a value of 2478.4.

Following the subtraction operation, it is observed that payment.amountForClosing equates to 547.7999999999997, though the displayed value rounds to 547.8. Despite this, when a user attempts to initiate another payment closure, validation measures detect insufficient funds due to the aforementioned state.

All monetary values originate from the C# WebApi 2.0 backend as System.Decimal types.

Answer №1

Handling currency poses unique challenges, especially when it comes to using floating point numbers. Due to the way floats are stored, certain calculations can yield inaccurate results. The safest approach is to represent currency as an Integer/BigInteger with a set number of decimal places, such as 4 digits to represent cents.

By utilizing integer values for currency operations and then dividing by a power of 10 at the end, you can ensure accurate results. It's recommended to convert any float values to integers before performing operations and then converting back as needed.

Answer №2

There has been ongoing discussion about floating point precision in Javascript, as seen in various sources such as here and here. Some options to address this issue include:

  1. Converting all numbers to integers.
  2. Formatting the result to a fixed number of significant digits using .toFixed(2)
  3. Utilizing a specialized datatype for decimals like BigDecimal

In this particular scenario, I tend to agree with @PerunSS that converting the numbers to integers before any operations, then converting them back, would be the optimal choice.

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