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| Current File : //proc/self/root/home/saurabh/.npm/_npx/249ca9fcd30c476a/node_modules/graphql/jsutils/keyMap.mjs |
/**
* Creates a keyed JS object from an array, given a function to produce the keys
* for each value in the array.
*
* This provides a convenient lookup for the array items if the key function
* produces unique results.
*
* const phoneBook = [
* { name: 'Jon', num: '555-1234' },
* { name: 'Jenny', num: '867-5309' }
* ]
*
* // { Jon: { name: 'Jon', num: '555-1234' },
* // Jenny: { name: 'Jenny', num: '867-5309' } }
* const entriesByName = keyMap(
* phoneBook,
* entry => entry.name
* )
*
* // { name: 'Jenny', num: '857-6309' }
* const jennyEntry = entriesByName['Jenny']
*
*/
export default function keyMap(list, keyFn) {
return list.reduce(function (map, item) {
map[keyFn(item)] = item;
return map;
}, Object.create(null));
}
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