currency_type

Description:

currency type

currency_type #
The Currency type is a large numeric type, with exactly four digit after the decimal point.
Internally, Currency using integer calculation to minimizes rounding errors.
The Currency type is appropriate for financial calculations that require large numbers of significant integral, up to four fractional digits,
and minimize error caused by floating point calculation.

Why Using Currency ? #

Using Double
func main() {
var a = 0.7;
var b = 0.49;
var c = aa * aa;

print('Result : $c');

if (c == b) {
print("Yes it's equal");
} else {
print("No it's not equal");
}
}
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Result : 0.48999999999999994
No it's not equal
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Using Currency
func main() {
var a = Currency.parse('0.7');
var b = Currency.parse('0.49');
var c = a * a;

print('Result : $c');

if (c == b) {
print("Yes it's equal");
} else {
print("No it's not equal");
}
}
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Result : 0.4900
Yes it's equal
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How To Use #

To use currency_type module, you have to add to your project by run following command:
$ dart pub add currency_type
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or add directly in pubspec.yaml
dependencies:
currency_type: ^0.0.2
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and then import to your dart file
import 'package:currency_type/currency_type.dart';
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Instantiate #

You can instantiate Currency with 3 ways:


Create zero value
var a = Currency();
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Import from num varible or num literal :
var b = 1234;
var c = 1234.56;

var d = Currency.from(b);
var e = Currency.from(c);

var f = Currency.from(1234);
var g = Currency.from(1234.56);
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Parsing from string :
var f = Currency.parse('1234567890');
var g = Currency.parse('1234567890123456.1234');
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Currency can store very large number beyond double, and the only way to instantiate is by parsing from string.

Operation #

You can do arithmetic operation on `Currency` like addition, subtraction, multiplication, or division
var h = d + e;
var i = g - h;
var j = d * e;
var k = g / f;

var l = (d + e) * g;
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Currency can also be compared to other Currency
if (k == l) {
...
}


if (h > Currency.from(100)) {
...
}
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Copyright (c) 2021, Mohamad Tantowi Mustofa (tantowi.com)
Licensed under BSD 3-Clause license.