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JavaScript MCQs

The following are sample code on how to loop through JavaScript object literals with objects as members:

Var validation_messages = {

“key_1” : {

“your_msg” : “hello world”

} ,

“Key_2” : {

“your_name” : “billy”,

“your_msg” : “foo equals bar”

}

}

Which of the following are invalid native JavaScript codes?

For (var key in validation_messages) { Var obj = validation_messages[key]; For (var prop in obj) { Alert(prop + “ = “ + obj[prop]); } }

Object.keys(validation_messages).forEach(function(key) { Var obj = validation_messages[key]; Object.keys(obj).forEach(function (key){ Alert(prop + “ = “ + obj [key] ); });

(validation_messages.hasOwnProperty(key) { Var obj = validation_messages[key]; For (var prop in obj) { If (obj.hasOwnproperty(prop) { Alert (prop + “ = “ + obj [prop]); } } } }

_.each(validation_messages, function(value,key) { _.each(value,function(value,key){ Alert(prop + “ = ” + value); });

Answer

Correct Answer: For (var key in validation_messages) { Var obj = validation_messages[key]; For (var prop in obj) { Alert(prop + “ = “ + obj[prop]); } }

Explanation:

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