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33 lines
1.1 KiB
TypeScript
33 lines
1.1 KiB
TypeScript
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// Loaded from https://deno.land/x/ramda@v0.27.2/source/indexBy.js
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import reduceBy from './reduceBy.js';
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/**
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* Given a function that generates a key, turns a list of objects into an
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* object indexing the objects by the given key. Note that if multiple
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* objects generate the same value for the indexing key only the last value
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* will be included in the generated object.
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*
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* Acts as a transducer if a transformer is given in list position.
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*
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* @func
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* @memberOf R
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* @since v0.19.0
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* @category List
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* @typedefn Idx = String | Int | Symbol
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* @sig Idx a => (b -> a) -> [b] -> {a: b}
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* @param {Function} fn Function :: a -> Idx
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* @param {Array} array The array of objects to index
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* @return {Object} An object indexing each array element by the given property.
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* @see R.groupBy
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* @example
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*
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* const list = [{id: 'xyz', title: 'A'}, {id: 'abc', title: 'B'}];
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* R.indexBy(R.prop('id'), list);
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* //=> {abc: {id: 'abc', title: 'B'}, xyz: {id: 'xyz', title: 'A'}}
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*/
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var indexBy = reduceBy(function(acc, elem) { return elem; }, null);
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export default indexBy;
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