| 1 | import baseAssignValue from './_baseAssignValue.js';
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| 2 | import createAggregator from './_createAggregator.js';
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| 3 |
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| 4 | /**
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| 5 | * Creates an object composed of keys generated from the results of running
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| 6 | * each element of `collection` thru `iteratee`. The corresponding value of
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| 7 | * each key is the last element responsible for generating the key. The
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| 8 | * iteratee is invoked with one argument: (value).
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| 9 | *
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| 10 | * @static
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| 11 | * @memberOf _
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| 12 | * @since 4.0.0
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| 13 | * @category Collection
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| 14 | * @param {Array|Object} collection The collection to iterate over.
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| 15 | * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
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| 16 | * @returns {Object} Returns the composed aggregate object.
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| 17 | * @example
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| 18 | *
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| 19 | * var array = [
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| 20 | * { 'dir': 'left', 'code': 97 },
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| 21 | * { 'dir': 'right', 'code': 100 }
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| 22 | * ];
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| 23 | *
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| 24 | * _.keyBy(array, function(o) {
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| 25 | * return String.fromCharCode(o.code);
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| 26 | * });
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| 27 | * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
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| 28 | *
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| 29 | * _.keyBy(array, 'dir');
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| 30 | * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
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| 31 | */
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| 32 | var keyBy = createAggregator(function(result, value, key) {
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| 33 | baseAssignValue(result, key, value);
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| 34 | });
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| 35 |
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| 36 | export default keyBy;
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