24 lines
646 B
JavaScript
24 lines
646 B
JavaScript
/**
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* Creates a keyed JS object from an array, given a function to produce the keys
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* and a function to produce the values from each item in the array.
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*
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* const phoneBook = [
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* { name: 'Jon', num: '555-1234' },
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* { name: 'Jenny', num: '867-5309' }
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* ]
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*
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* // { Jon: '555-1234', Jenny: '867-5309' }
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* const phonesByName = keyValMap(
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* phoneBook,
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* entry => entry.name,
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* entry => entry.num
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* )
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*
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*/
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export default function keyValMap(list, keyFn, valFn) {
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return list.reduce(function (map, item) {
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map[keyFn(item)] = valFn(item);
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return map;
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}, Object.create(null));
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}
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