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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 |