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What's the best way to learn LISP? [closed]
...used what I learned about LISP, but it made me a much better programmer in all other languages.
– Robert K
Dec 29 '08 at 21:40
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mongodb, replicates and error: { “$err” : “not master and slaveOk=false”, “code” : 13435 }
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You have to set "slave okay" mode to let the mongo shell know that you're allowing reads from a secondary. This is to protect you and your applications from performing eventually consistent reads by accident. You can do this in the shell with:
rs.slaveOk()
After that you can query normally from ...
How to compare variables to undefined, if I don’t know whether they exist? [duplicate]
...s a string, and doesn't generate an error if the variable doesn't exist at all.
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Is there any performance reason to declare method parameters final in Java?
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I have seen Sun's compiler emit marginally shorter bytecode when the only difference between the two methods has been the "finality" of local variables. Micro-optimizations are a real thing, and compilers do actually make them. What really matters, of course, is ...
Check if checkbox is checked with jQuery
...here is more than one checkbox with that class name. The is(':checked') really only works on one element.
– John Boker
Apr 17 '13 at 12:59
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Cannot set boolean values in LocalStorage?
...ber or a boolean, the operands are converted to numbers if possible - I totally didn't realize that. I thought if one were a string, the other was cast to a string. Cheers (+1).
– Andy E
Jul 16 '10 at 9:01
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Read binary file as string in Ruby
...g it as a one-liner solution (like so many things on stackoverflow)? After all, it works, and the name for these functions were just an arbitrary choice of the ruby library designers. If only we had some language with synonyms... that still somehow knows exactly what we want in edge cases/ambiguous ...
Branch from a previous commit using Git
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@MattFenwick Git will allow you to use shortened hashes everywhere a hash is allowed, as long as the shortened hash is ''unique'' in the repository. So if it didn’t work, try adding another character from the hash.
– poke
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How is a tag different from a branch in Git? Which should I use, here?
... development efforts on the same code base. Changes to a branch may eventually be merged back into another branch to unify them.
Usually you'll tag a particular version so that you can recreate it, e.g., this is the version we shipped to XYZ Corp. A branch is more of a strategy to provide on-goi...
Meaning of Git checkout double dashes
...maybe 20 or so), most commands are separate programs from Bash. It is actually part of the POSIX standard that -- can be used to separate options from other arguments, so you will see it on commands like cp and mv (which are not part of Bash).
– Dietrich Epp
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