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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | 10x 1x 10x 10x 2x | export interface CaseBlock<A, B> extends Readonly<{ case: A do: () => B }> {} function matchesScrutinee<A, B> (scrutinee: A, caseBlock: CaseBlock<A, B>): boolean { return JSON.stringify(caseBlock.case) === JSON.stringify(scrutinee) } export function patternMatch<A, B> (scrutinee: A, cases: ReadonlyArray<CaseBlock<A, B>>, defaultBlock: () => B): B { for (const currentCase of cases) { if (matchesScrutinee(scrutinee, currentCase)) return currentCase.do() } return defaultBlock() } |