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Meaning of “[: too many arguments” error from if [] (square brackets)
I couldn't find any one simple straightforward resource spelling out the meaning of and fix for the following BASH shell error, so I'm posting what I found after researching it.
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Is null check needed before calling instanceof?
Will null instanceof SomeClass return false or throw a NullPointerException ?
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Check if object value exists within a Javascript array of objects and if not add a new object to arr
If I have the following array of objects:
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Heroku “psql: FATAL: remaining connection slots are reserved for non-replication superuser connectio
I'm developing an app on Heroku with a Postgresql backend. Periodically, I get this error message when trying to access the database, both from the CLI and from loading a page on the server:
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Generic List - moving an item within the list
So I have a generic list, and an oldIndex and a newIndex value.
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How to clone git repository with specific revision/changeset?
How can I clone git repository with specific revision, something like I usually do in Mercurial:
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What does Bump Version stand for?
I saw this comment in git many times.
What does it mean actually?
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Get last element of Stream/List in a one-liner
How can I get the last element of a stream or list in the following code?
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How to close IPython Notebook properly?
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There isn't currently a better way to do it than Ctrl+C in the terminal.
We're thinking about how to have an explicit shutdown, but there's some tension between the notebook as a single-user application, where the user is free to stop it, and as a multi-user server, where only an...
Best way to create an empty map in Java
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1) If the Map can be immutable:
Collections.emptyMap()
// or, in some cases:
Collections.<String, String>emptyMap()
You'll have to use the latter sometimes when the compiler cannot automatically figure out what kind of Map is needed (this is called type inference). For example, ...