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20220330_Vote/Ewide.Web.Entry/wwwroot/lib/xe-utils/countBy.js

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+var groupBy = require('./groupBy')
+
+var objectEach = require('./objectEach')
+
+/**
+  * 集合分组统计,返回各组中对象的数量统计
+  *
+  * @param {Array} obj 对象
+  * @param {Function} iterate 回调/对象属性
+  * @param {Object} context 上下文
+  * @return {Object}
+  */
+function countBy (obj, iterate, context) {
+  var result = groupBy(obj, iterate, context || this)
+  objectEach(result, function (item, key) {
+    result[key] = item.length
+  })
+  return result
+}
+
+module.exports = countBy