Created
October 23, 2019 19:16
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| abstract class Season { | |
| cata<W, Su, Sp, Au>(match: { | |
| Winter: () => W, | |
| Summer: () => Su, | |
| Autumn: () => Au, | |
| Spring: () => Sp | |
| }) { | |
| type constraintsT = keyof typeof match; | |
| switch (this.constructor.name as unknown as constraintsT) { | |
| case 'Winter': { | |
| return match['Winter']() | |
| } | |
| case 'Summer': { | |
| return match['Summer'](); | |
| } | |
| case 'Autumn': { | |
| return match['Autumn'](); | |
| } | |
| case 'Spring': { | |
| return match['Spring'](); | |
| } | |
| } | |
| } | |
| } | |
| class Summer extends Season { constructor() { super() } } | |
| class Autumn extends Season { constructor() { super() } } | |
| class Winter extends Season { constructor() { super() } } | |
| class Spring extends Season { constructor() { super() } } | |
| const la = new Summer(); | |
| const next = la.cata({ | |
| Winter: () => new Spring(), | |
| Summer: () => new Autumn(), | |
| Autumn: () => new Winter(), | |
| Spring: () => new Summer(), | |
| }) |
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