lodash/lodash

Feb 23, 2017

falsyvalues Missing iteratee call in `countBy` (missed in 5baad4d).

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36 lines (32 sloc) 1.07 KB

      
        import baseAssignValue from './.internal/baseAssignValue.js'
      
        import reduce from './reduce.js'
      
        /** Used to check objects for own properties. */
      
        const hasOwnProperty = Object.prototype.hasOwnProperty
      
        /**
      
         * Creates an object composed of keys generated from the results of running
      
         * each element of `collection` thru `iteratee`. The corresponding value of
      
         * each key is the number of times the key was returned by `iteratee`. The
      
         * iteratee is invoked with one argument: (value).
      
         *
      
         * @since 0.5.0
      
         * @category Collection
      
         * @param {Array|Object} collection The collection to iterate over.
      
         * @param {Function} iteratee The iteratee to transform keys.
      
         * @returns {Object} Returns the composed aggregate object.
      
         * @example
      
         *
      
         * countBy([6.1, 4.2, 6.3], Math.floor)
      
         * // => { '4': 1, '6': 2 }
      
         */
      
        function countBy(collection, iteratee) {
      
          return reduce(collection, (result, value, key) => {
      
            key = iteratee(value)
      
            if (hasOwnProperty.call(result, key)) {
      
              ++result[key]
      
            } else {
      
              baseAssignValue(result, key, 1)
      
            }
      
            return result
      
          }, {})
      
        }
      
        export default countBy

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