You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
47 lines
962 B
47 lines
962 B
/*
|
|
MIT License http://www.opensource.org/licenses/mit-license.php
|
|
Author Tobias Koppers @sokra
|
|
*/
|
|
|
|
"use strict";
|
|
|
|
/**
|
|
* @template T
|
|
* @param {Iterable<T>} set a set
|
|
* @returns {T | undefined} last item
|
|
*/
|
|
const last = set => {
|
|
let last;
|
|
for (const item of set) last = item;
|
|
return last;
|
|
};
|
|
|
|
/**
|
|
* @template T
|
|
* @param {Iterable<T>} iterable iterable
|
|
* @param {function(T): boolean} filter predicate
|
|
* @returns {boolean} true, if some items match the filter predicate
|
|
*/
|
|
const someInIterable = (iterable, filter) => {
|
|
for (const item of iterable) {
|
|
if (filter(item)) return true;
|
|
}
|
|
return false;
|
|
};
|
|
|
|
/**
|
|
* @template T
|
|
* @param {Iterable<T>} iterable an iterable
|
|
* @returns {number} count of items
|
|
*/
|
|
const countIterable = iterable => {
|
|
let i = 0;
|
|
// eslint-disable-next-line no-unused-vars
|
|
for (const _ of iterable) i++;
|
|
return i;
|
|
};
|
|
|
|
exports.last = last;
|
|
exports.someInIterable = someInIterable;
|
|
exports.countIterable = countIterable;
|