| 1 | var groupBy = require('./groupBy')
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| 2 |
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| 3 | var objectEach = require('./objectEach')
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| 4 |
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| 5 | /**
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| 6 | * 集合分组统计,返回各组中对象的数量统计
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| 7 | *
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| 8 | * @param {Array} obj 对象
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| 9 | * @param {Function} iterate 回调/对象属性
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| 10 | * @param {Object} context 上下文
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| 11 | * @return {Object}
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| 12 | */
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| 13 | function countBy (obj, iterate, context) {
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| 14 | var result = groupBy(obj, iterate, context || this)
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| 15 | objectEach(result, function (item, key) {
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| 16 | result[key] = item.length
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| 17 | })
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| 18 | return result
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| 19 | }
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| 20 |
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| 21 | module.exports = countBy
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