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Lodash - findKey method
Syntax
_.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.
Arguments
object (Object) − The object to inspect.
[predicate=_.identity] (Function) − The function invoked per iteration.
Output
(*) − Returns the key of the matched element, else undefined.
Example
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
\>node tester.js
Output
Joe
lodash_object.htm
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