Top "Object" questions

Checking if a key exists in a JavaScript object?

How do I check if a particular key exists in a JavaScript object or array? If a key doesn't exist, …

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What is the most efficient way to deep clone an object in JavaScript?

What is the most efficient way to clone a JavaScript object? I've seen obj = eval(uneval(o)); being used, but …

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Converting an object to a string

How can I convert a JavaScript object into a string? Example: var o = {a:1, b:2} console.log(o) console.log(…

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Convert JS object to JSON string

If I defined an object in JS with: var j={"name":"binchen"}; How can I convert the object to JSON? …

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Iterate through object properties

How does the variable propt represent the properties of the object? It's not a built-in method or property. Why does …

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How to avoid null checking in Java?

I use object != null a lot to avoid NullPointerException. Is there a good alternative to this? For example I often …

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Detecting an undefined object property

What's the best way of checking if an object property in JavaScript is undefined?

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How do I check if an object has a key in JavaScript?

Which is the right thing to do? if (myObj['key'] == undefined) or if (myObj['key'] == null) or if (myObj['key'])

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How do I copy an object in Java?

Consider the code below: DummyBean dum = new DummyBean(); dum.setDummy("foo"); System.out.println(dum.getDummy()); // prints 'foo' DummyBean dumtwo = …

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How to add an object to an array

How can I add an object to an array (in javascript or jquery)? For example, what is the problem with …

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