lodash/lodash

Apr 16, 2017
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        /**
      
         * The opposite of `mapValue` this method creates an object with the
      
         * same values as `object` and keys generated by running each own enumerable
      
         * string keyed property of `object` thru `iteratee`. The iteratee is invoked
      
         * with three arguments: (value, key, object).
      
         *
      
         * @since 3.8.0
      
         * @category Object
      
         * @param {Object} object The object to iterate over.
      
         * @param {Function} iteratee The function invoked per iteration.
      
         * @returns {Object} Returns the new mapped object.
      
         * @see mapValue
      
         * @example
      
         *
      
         * mapKey({ 'a': 1, 'b': 2 }, function(value, key) {
      
         *   return key + value
      
         * })
      
         * // => { 'a1': 1, 'b2': 2 }
      
         */
      
        function mapKey(object, iteratee) {
      
          object = Object(object)
      
          const result = {}
      
          Object.keys(object).forEach((key) => {
      
            const value = object[key]
      
            result[iteratee(value, key, object)] = value
      
          })
      
          return result
      
        }
      
        export default mapKey
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