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One-liner to check whether an iterator yields at least one element?
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Similarly if you need to check if the iterator is empty, one could use all(False for _ in iterator) will check if the iterator is empty. (all returns True if the iterator is empty, otherwise it stops when it sees the first False element)
– KGardevoir
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What is the best way to solve an Objective-C namespace collision?
Objective-C has no namespaces; it's much like C, everything is within one global namespace. Common practice is to prefix classes with initials, e.g. if you are working at IBM, you could prefix them with "IBM"; if you work for Microsoft, you could use "MS"; and so on. Sometimes the initials refer to ...
Can you delete multiple branches in one command with Git?
...ith things like * and -> (for symrefs) which can mess you up in scripts/one-liners.
– Cascabel
Sep 8 '10 at 23:05
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Why don't they teach these things in school? [closed]
... I'm really wondering why they don't teach a few of the things I learned sooner in school though. To name a few:
32 Answer...
How can I use inverse or negative wildcards when pattern matching in a unix/linux shell?
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pattern matching operators are recognized.A pattern-list is a list of one or more patterns separated by a |. Composite patterns may be formed using one or more of the following sub-patterns:
?(pattern-list)
Matches zero or one occurrence of the given patterns
*(pattern-list)
Ma...
Spring Data: “delete by” is supported?
...Atapin Downvote because it is no longer a good answer. Maybe delete it ? One of stackoverflows flaws is handling version changes / bugfixes associated with libraries in question.
– Ben George
Jan 15 '15 at 15:35
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Difference between Key, Primary Key, Unique Key and Index in MySQL
...' records are held. This is very similar to how we, humans, go through a phone book directory to find someone by the last name: We don't start searching through the directory from cover to cover, as long we inserted the information in some order that we can use to skip quickly to the 'S' pages.
Pri...
Avoid synchronized(this) in Java?
...int separately.
Some evil code may steal your lock (very popular this one, also has an
"accidentally" variant)
I'm more worried about accidentally. What it amounts to is that this use of this is part of your class' exposed interface, and should be documented. Sometimes the ability of othe...
what is the basic difference between stack and queue?
...aper. The last piece put into the stack is on the top, so it is the first one to come out. This is LIFO. Adding a piece of paper is called "pushing", and removing a piece of paper is called "popping".
Imagine a queue at the store. The first person in line is the first person to get out of lin...
Emacs on Mac OS X Leopard key bindings
... here are the key bindings, for moving around text:
⌥ + ← - move left one word
⌥ + → - move right one word
⌥ + delete - back delete one word
Shift + ⌥ + delete - foward delete one word
⌥ + ↑ - move up one paragraph
⌥ + ↓ - move down one paragraph
⌘ + ← - move to start of cur...