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35 lines
1.1 KiB
35 lines
1.1 KiB
9 years ago
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var createAggregator = require('./_createAggregator');
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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` through `iteratee`. The corresponding value
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* of 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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* @static
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* @memberOf _
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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|Object|string} [iteratee=_.identity] The iteratee to transform keys.
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* @returns {Object} Returns the composed aggregate object.
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* @example
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*
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* var 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, function(o) {
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* return String.fromCharCode(o.code);
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* });
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* // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
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*
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* _.keyBy(array, 'dir');
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* // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
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*/
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var keyBy = createAggregator(function(result, value, key) {
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result[key] = value;
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});
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module.exports = keyBy;
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