money2
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Allocation

Allocation According to Ratios

Let our company have made a profit of 5 cents, which has to be divided amongst a company (70%) and an investor (30%). Cents can't be divided, so We can't give 3.5 and 1.5 cents. If we round up, the company gets 4 cents, the investor gets 2, which means we need to conjure up an additional cent.
The best solution to avoid this pitfall is to use allocation according to ratios.
import 'money2.dart';
final profit = Money.fromBigInt(BigInt.from(5), usd); // 5¢
var allocation = profit.allocationAccordingTo([70, 30]);
assert(allocation[0] == Money.fromBigInt(BigInt.from(4), usd)); // 4¢
assert(allocation[1] == Money.fromBigInt(BigInt.from(1), usd)); // 1¢
// The order of ratios is important:
allocation = profit.allocationAccordingTo([30, 70]);
assert(allocation[0] == Money.fromBigInt(BigInt.from(2), usd)); // 2¢
assert(allocation[1] == Money.fromBigInt(BigInt.from(3), usd)); // 3¢

Allocation to N Targets

An amount of money can be allocated to N targets using allocateTo().
import 'money2.dart';
final value = Money.fromBigInt(BigInt.from(800), usd); // $8.00
final allocation = value.allocationTo(3);
assert(allocation[0] == Money.fromBigInt(BigInt.from(267), usd)); // $2.67
assert(allocation[1] == Money.fromBigInt(BigInt.from(267), usd)); // $2.67
assert(allocation[2] == Money.fromBigInt(BigInt.from(266), usd)); // $2.66
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