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46 lines
962 B
46 lines
962 B
/* |
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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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// eslint-disable-next-line no-unused-vars |
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for (const _ of iterable) i++; |
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return i; |
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}; |
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exports.last = last; |
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exports.someInIterable = someInIterable; |
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exports.countIterable = countIterable;
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