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
12 lines
376 B
JavaScript
12 lines
376 B
JavaScript
var _group = require('./_group.js');
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var _has = require('./_has.js');
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// Counts instances of an object that group by a certain criterion. Pass
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// either a string attribute to count by, or a function that returns the
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// criterion.
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var countBy = _group(function(result, value, key) {
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if (_has(result, key)) result[key]++; else result[key] = 1;
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});
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module.exports = countBy;
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