Source: \findKey.js
/**
* 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 = value
return true
}
})
return result
}
export default findKey