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The Wayback Machine - https://web.archive.org/web/20201220220851/https://github.com/lodash/lodash/blob/master/findKey.js
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/**
* This method is like `find` except that it returns the key of the first
* element `predicate` returns truthy for instead of the element itself.
*
* @since 1.1.0
* @category Object
* @param {Object } object The object to inspect.
* @param {Function } predicate The function invoked per iteration.
* @returns {string|undefined } Returns the key of the matched element,
* else `undefined`.
* @see find, findIndex, findLast, findLastIndex, findLastKey
* @example
*
* const users = {
* 'barney': { 'age': 36, 'active': true },
* 'fred': { 'age': 40, 'active': false },
* 'pebbles': { 'age': 1, 'active': true }
* }
*
* findKey(users, ({ age }) => age < 40)
* // => 'barney' (iteration order is not guaranteed)
*/
function findKey ( object , predicate ) {
let result
if ( object == null ) {
return result
}
Object . keys ( object ) . some ( ( key ) => {
const value = object [ key ]
if ( predicate ( value , key , object ) ) {
result = key
return true
}
} )
return result
}
export default findKey
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