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