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33 lines
1.0 KiB
JavaScript
33 lines
1.0 KiB
JavaScript
import baseAssignValue from './.internal/baseAssignValue.js'
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import reduce from './reduce.js'
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/**
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* Creates an object composed of keys generated from the results of running
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* each element of `collection` thru `iteratee`. The corresponding value of
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* each key is the last element responsible for generating the key. The
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* iteratee is invoked with one argument: (value).
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*
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* @since 4.0.0
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* @category Collection
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* @param {Array|Object} collection The collection to iterate over.
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* @param {Function} iteratee The iteratee to transform keys.
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* @returns {Object} Returns the composed aggregate object.
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* @see groupBy, partition
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* @example
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*
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* const array = [
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* { 'dir': 'left', 'code': 97 },
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* { 'dir': 'right', 'code': 100 }
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* ]
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*
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* keyBy(array, ({ code }) => String.fromCharCode(code))
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* // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
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*/
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function keyBy(collection, iteratee) {
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return reduce(collection, (result, value, key) => (
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baseAssignValue(result, key, value)
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), {})
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}
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export default keyBy
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