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Add Predicate type
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@ -1,9 +1,10 @@
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import { EndoRelation } from "./relation";
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import { EndoRelation, Predicate } from './relation';
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/**
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* Count the number of elements that satisfy the predicate
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*/
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export function countIf<T>(f: (x: T) => boolean, xs: T[]): number {
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export function countIf<T>(f: Predicate<T>, xs: T[]): number {
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return xs.filter(f).length;
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}
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@ -97,7 +98,7 @@ export function lessThan(xs: number[], ys: number[]): boolean {
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/**
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* Returns the longest prefix of elements that satisfy the predicate
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*/
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export function takeWhile<T>(f: (x: T) => boolean, xs: T[]): T[] {
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export function takeWhile<T>(f: Predicate<T>, xs: T[]): T[] {
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const ys = [];
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for (const x of xs) {
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if (f(x)) {
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@ -1,3 +1,5 @@
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export type Predicate<T> = (x: T) => boolean;
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export type Relation<T, U> = (x: T, y: U) => boolean;
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export type EndoRelation<T> = Relation<T, T>;
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