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How can I determine if a variable is 'undefined' or 'null'?
How do I determine if variable is undefined or null ?
30 Answers
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What is the difference between
...rackets; not sent to client (as opposed to HTML comments).
Visit Ruby Doc for more infos about ERB.
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How do Mockito matchers work?
...rgument matchers (such as any , argThat , eq , same , and ArgumentCaptor.capture() ) behave very differently from Hamcrest matchers.
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&& (AND) and || (OR) in IF statements
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No, it will not be evaluated. And this is very useful. For example, if you need to test whether a String is not null or empty, you can write:
if (str != null && !str.isEmpty()) {
doSomethingWith(str.charAt(0));
}
or, the other way around
if (str == null || str.isEmpt...
Depend on a branch or tag using a git URL in a package.json?
Say I've forked a node module with a bugfix and I want to use my fixed version, on a feature branch of course, until the bugfix is merged and released.
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Iterator invalidation rules
What are the iterator invalidation rules for C++ containers?
6 Answers
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Why don't they teach these things in school? [closed]
Over the summer, I was fortunate enough to get into Google Summer of Code. I learned a lot (probably more than I've learned in the sum of all my university coursework). I'm really wondering why they don't teach a few of the things I learned sooner in school though. To name a few:
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javax.faces.application.ViewExpiredException: View could not be restored
...which I logout, then I come back to first page and I click on any link etc or refresh page I get this exception. I guess it's normal (or maybe not:)) because I logged out and session is destroyed. What should I do to redirect user to for example index.xhtml or login.xhtml and save him from seeing th...
How do I prevent site scraping? [closed]
...ta (I enter dummy Artist names here and there and then do google searches for them).
26 Answers
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Ignoring directories in Git repositories on Windows
How can I ignore directories or folders in Git using msysgit on Windows?
18 Answers
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