lodash / lodash

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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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