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Resolve #2625 (#2627)

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Aya Morisawa 2018-09-06 02:16:08 +09:00 • committed by syuilo
parent b5ff2abdb9
commit 395cfa6108
9 changed files with 25 additions and 9 deletions
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7
src/prelude/array.ts Normal file
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@ -0,0 +1,7 @@
export function countIf<T>(f: (x: T) => boolean, xs: T[]): number {
return xs.filter(f).length;
}
export function count<T>(x: T, xs: T[]): number {
return countIf(y => x === y, xs);
}