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8 lines
187 B
TypeScript
8 lines
187 B
TypeScript
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export function countIf<T>(f: (x: T) => boolean, xs: T[]): number {
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return xs.filter(f).length;
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}
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export function count<T>(x: T, xs: T[]): number {
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return countIf(y => x === y, xs);
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}
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