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How to check if object (variable) is defined in R?

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How do I analyze a .hprof file?

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Create a new database with MySQL Workbench

... to MySQL, I have installed the latest version of the MySQL Workbench (5.2.33). I would like to know how you can create a database with this application. In the Overview tab of the SQL editor there are few "MySQL Schema" displayed, are these schemas the existing databases? ...
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Is there a download function in jsFiddle?

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JPG vs. JPEG image formats

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Placing border inside of div and not on its edge

... 673 Set box-sizing property to border-box: div { box-sizing: border-box; -moz-box-siz...
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How do I trim whitespace from a string?

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What's Mongoose error Cast to ObjectId failed for value XXX at path “_id”?

When sending a request to /customers/41224d776a326fb40f000001 and a document with _id 41224d776a326fb40f000001 does not exist, doc is null and I'm returning a 404 : ...
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Workflow for statistical analysis and report writing

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Definitive way to trigger keypress events with jQuery

... 367 If you want to trigger the keypress or keydown event then all you have to do is: var e = jQue...