Lodash findKey method
语法
_.findKey(object, [predicate=_.identity])
This method is like _.find except that it returns the key of the first element predicate returns truthy for instead of the element itself.
参数
object (Object) − The object to inspect.
[predicate=_.identity] (Function) − The function invoked per iteration.
输出
(*) − Returns the key of the matched element, else undefined.
实例
var _ = require('lodash');
var users = {
'Joe': { 'age': 36, 'active': true },
'Robert': { 'age': 40, 'active': false },
'Stefan': { 'age': 10, 'active': true }
};
var result = _.findKey(users, function(o) { return o.age < 40; });
console.log(result);
Save the above program in
tester.js. Run the following command to execute this program.
Command
输出
