flying-hero
96f6318101
新增: - backend/venv/ - Python 虚拟环境 - backend/start.sh - 启动脚本（使用虚拟环境） - backend/requirements.txt - 依赖列表 - .gitignore - 忽略虚拟环境和缓存文件 说明: - 每个项目使用独立虚拟环境 - 避免依赖冲突 - 启动脚本自动创建和激活虚拟环境
47 lines
993 B
JavaScript
47 lines
993 B
JavaScript
/*
|
|
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) => {
|
|
/** @type {T | undefined} */
|
|
let last;
|
|
for (const item of set) last = item;
|
|
return last;
|
|
};
|
|
|
|
/**
|
|
* @template T
|
|
* @param {Iterable<T>} iterable iterable
|
|
* @param {(value: T) => boolean | null | undefined} 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;
|
|
for (const _ of iterable) i++;
|
|
return i;
|
|
};
|
|
|
|
module.exports.countIterable = countIterable;
|
|
module.exports.last = last;
|
|
module.exports.someInIterable = someInIterable;
|