46 lines
939 B
JavaScript
46 lines
939 B
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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/**
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* @template T
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* @param {Iterable<T>} set a set
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* @returns {T | undefined} last item
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*/
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const last = set => {
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let last;
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for (const item of set) last = item;
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return last;
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};
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/**
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* @template T
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* @param {Iterable<T>} iterable iterable
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* @param {function(T): boolean} filter predicate
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* @returns {boolean} true, if some items match the filter predicate
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*/
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const someInIterable = (iterable, filter) => {
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for (const item of iterable) {
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if (filter(item)) return true;
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}
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return false;
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};
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/**
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* @template T
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* @param {Iterable<T>} iterable an iterable
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* @returns {number} count of items
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*/
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const countIterable = iterable => {
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let i = 0;
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for (const _ of iterable) i++;
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return i;
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};
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module.exports.last = last;
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module.exports.someInIterable = someInIterable;
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module.exports.countIterable = countIterable;
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