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# Ord The `Ord` macro generates a `compareTo()` method for **total ordering** comparison. This is analogous to Rust's `Ord` trait, enabling objects to be sorted and compared with a guaranteed ordering relationship. ## Generated Output | Type | Generated Code | Description | |------|----------------|-------------| | Class | `classNameCompare(a, b)` + `static compareTo(a, b)` | Standalone function + static wrapper method | | Enum | `enumNameCompare(a: EnumName, b: EnumName): number` | Standalone function comparing enum values | | Interface | `interfaceNameCompare(a: InterfaceName, b: InterfaceName): number` | Standalone function comparing fields | | Type Alias | `typeNameCompare(a: TypeName, b: TypeName): number` | Standalone function with type-appropriate comparison | ## Return Values Unlike `PartialOrd`, `Ord` provides **total ordering** - every pair of values can be compared: - **-1**: `a` is less than `b` - **0**: `a` is equal to `b` - **1**: `a` is greater than `b` The function **never returns null** - all values must be comparable. ## Comparison Strategy Fields are compared **lexicographically** in declaration order: 1. Compare first field 2. If not equal, return that result 3. Otherwise, compare next field 4. Continue until a difference is found or all fields are equal ## Type-Specific Comparisons | Type | Comparison Method | |------|-------------------| | `number`/`bigint` | Direct `<` and `>` comparison | | `string` | `localeCompare()` (clamped to -1, 0, 1) | | `boolean` | false &lt; true | | Arrays | Lexicographic element-by-element | | `Date` | `getTime()` timestamp comparison | | Objects | Calls `compareTo()` if available, else 0 | ## Field-Level Options The `@ord` decorator supports: - `skip` - Exclude the field from ordering comparison ## Example ```typescript before /** @derive(Ord) */ class Version { major: number; minor: number; patch: number; } ``` ```typescript after class Version { major: number; minor: number; patch: number; static compareTo(a: Version, b: Version): number { return versionCompare(a, b); } } export function versionCompare(a: Version, b: Version): number { if (a === b) return 0; const cmp0 = a.major < b.major ? -1 : a.major > b.major ? 1 : 0; if (cmp0 !== 0) return cmp0; const cmp1 = a.minor < b.minor ? -1 : a.minor > b.minor ? 1 : 0; if (cmp1 !== 0) return cmp1; const cmp2 = a.patch < b.patch ? -1 : a.patch > b.patch ? 1 : 0; if (cmp2 !== 0) return cmp2; return 0; } ``` ## Ord vs PartialOrd - Use **Ord** when all values are comparable (total ordering) - Use **PartialOrd** when some values may be incomparable (returns `Option<number>`)

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