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| match(1) | |
| .with(1, v => v * 2) | |
| .with(2, v => v * v) | |
| .otherwise(() => -1) | |
| .run() |
WimJongeneel
/ match.ts
Last active
December 15, 2019 11:42
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| export const match = <a, b>(value: a) => builder<a, b>(value)(() => undefined, []) | |
| const builder = <a, b>( | |
| value: a | |
| ) => ( | |
| otherwise: () => b = () => null, | |
| patterns: Array<[Pattern<a>, Fun<a, b>]> = [] | |
| ) => ({ | |
| with: (pattern: a, expr: fun<a, b>) => | |
| builder(value)(otherwise, [...patterns, [pattern, expr]]), |
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