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Dart implementation of Fowler's Money pattern

Money #

Dart implementation of Fowler's Money pattern.

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Usage Examples #

Creating a Money object and accessing its monetary value #

// Create a money object that represents 1 USD
final money = Money(100, Currency('USD'));

// Access the Money object's monetary value
print(money.amount); // => 100

// -- OR --
print(money.amountAsString); // => 1.00

Creating a Money object from a string value

final money = Money.fromString('12.50', Currency('USD'));

print(money.amount); // => 1250

Creating a money from a double value

final money = Money.fromDouble(12.34, Currency('USD'));

print(money.amount); // => 1234

Simple conversion to a string #

final money = Money(150, Currency('USD'));

print(money.toString()); // => 1.50 USD

Basic arithmetic using Money objects #

// Create two Money objects that represent 1 USD and 2 USD, respectively
final a = Money(100, Currency('USD'));
final b = Money(200, Currency('USD'));

var c = null;

// Negate a Money object
c = -a;
print(c); // => -1.00 USD

// Calculate the sum of two Money objects
c = a + b;
print(c); // => 3.00 USD


// Calculate the difference of two Money objects
c = b - a;
print(c); // => 1.00 USD

// Multiply a Money object with a factor
c = a * 2;
print(c); // => 2.00 USD

Comparing Money objects #

final a = Money(100, Currency('USD'));
final b = Money(200, Currency('USD'));

a < b; // => true
a > b; // => false

b <= a; // => false
b => a; // => true

a.compareTo(b); // => -1
a.compareTo(a); // =>  0
b.compareTo(a); // =>  1

The compareTo() method returns an integer less than, equal to, or greater than zero if the value of one Money object is considered to be respectively less than, equal to, or greater than that of another Money object.

Money implements Comparable interface and you can sort a list of Money objects.

Allocate the monetary value represented by a Money object using a list of ratios #

final a = Money(5, Currency('USD'));

for (var c in a.allocate(3, 7)) {
  print(c);
}

The code above produces the output shown below:

2
3
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Dart implementation of Fowler's Money pattern

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