Monetary amount
A monetary amount is a quantity of money represented by a numeric value together with a currency.
Learn Go with Pocket-Sized Projects
An amount is a monetary value whose numeric representation is interpreted with a currency and subject to supported precision constraints.
- How it is used
- Represents the quantity-and-currency input and output of a command-line currency converter.
- How deep it goes
- Works through representation, construction, conversion, validation, and tests, while retaining explicit supported-range limitations.
- Examples
- Uses 19.8875 Canadian dollars as an invalid amount and conversion tests covering target precision, large values, and small rates.
- What you can do after
- Build it from scratch as a validated Go Amount type and test its construction and conversion boundaries.
Read how Learn Go with Pocket-Sized Projects explains monetary amount →
Building User-Friendly DSLs
A DSL type whose values represent monetary amounts.
- How it is used
- Enables rental-price attributes and expressions to represent dollar values distinctly from percentages and date ranges.
- How deep it goes
- Works through bottom-up expression typing on ASTs, including references, binary operations, parentheses, and an untyped fallback.
- Examples
- Uses a discounted rental-price expression with amount references, a percentage discount, of, and subtraction.
- What you can do after
- Evaluate/understand whether rental-price expressions compute to an amount and why invalid type combinations require errors.
Read how Building User-Friendly DSLs explains monetary amount →
Related concepts
- Stringerimplements · fmt.Stringer is a Go standard-library interface implemented by a type with a parameterless String method returning a textual representation.
- account balanceincludes · An account balance is the recorded amount of money or funds associated with a financial account.
- BigDecimalused by · BigDecimal is a Java standard-library class representing immutable, arbitrary-precision signed decimal values.
- currencyhas part · Currency is a system and unit of money used to express monetary value, facilitate exchange, and denominate financial amounts.
- fraud detectionused by · Fraud detection is the process of identifying transactions, activities, or other events suspected of involving intentional deception or unauthorized gain.
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