lodash/lodash

Feb 6, 2017
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        import baseFlatten from './.internal/baseFlatten.js'
      
        import baseUniq from './.internal/baseUniq.js'
      
        import isArrayLikeObject from './isArrayLikeObject.js'
      
        import last from './last.js'
      
        /**
      
         * This method is like `union` except that it accepts `iteratee` which is
      
         * invoked for each element of each `arrays` to generate the criterion by
      
         * which uniqueness is computed. Result values are chosen from the first
      
         * array in which the value occurs. The iteratee is invoked with one argument:
      
         * (value).
      
         *
      
         * @since 4.0.0
      
         * @category Array
      
         * @param {...Array} [arrays] The arrays to inspect.
      
         * @param {Function} iteratee The iteratee invoked per element.
      
         * @returns {Array} Returns the new array of combined values.
      
         * @see difference, union, unionWith, without, xor, xorBy
      
         * @example
      
         *
      
         * unionBy([2.1], [1.2, 2.3], Math.floor)
      
         * // => [2.1, 1.2]
      
         */
      
        function unionBy(...arrays) {
      
          let iteratee = last(arrays)
      
          if (isArrayLikeObject(iteratee)) {
      
            iteratee = undefined
      
          }
      
          return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), iteratee)
      
        }
      
        export default unionBy
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lodash/lodash

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