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How do I get the first n characters of a string without checking the size or going out of bounds?
...f a string in Java without doing a size check first (inline is acceptable) or risking an IndexOutOfBoundsException ?
9 Ans...
How to get the last value of an ArrayList
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Won't work. what if the list is empty, list.size() will return 0. and you'll end up with list.get(-1);
– FRR
Jan 21 '15 at 19:36
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Remove blank lines with grep
I tried grep -v '^$' in Linux and that didn't work. This file came from a Windows file system.
14 Answers
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CSS Properties: Display vs. Visibility
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The visibility property only tells the browser whether to show an element or not. It's either visible (visible - you can see it), or invisible (hidden - you can't see it).
The display property tells the browser how to draw and show an element, if at all - whether it should be displayed as an inlin...
NoSQL (MongoDB) vs Lucene (or Solr) as your database
...e my lessons learned:
You can easily use Lucene/Solr in lieu of MongoDB for pretty much all situations, but not vice versa. Grant Ingersoll's post sums it up here.
MongoDB etc. seem to serve a purpose where there is no requirement of searching and/or faceting. It appears to be a simpler and arguab...
Does const mean thread-safe in C++11?
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[1.10/4]
Two expression evaluations conflict if one of them modifies a memory location (1.7) and the other one accesses or modifies the same memory location.
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The execution of a program contains a data race if it contains two conflicting actions in different threads, at least one of which ...
How to solve PHP error 'Notice: Array to string conversion in…'
I have a PHP file that tries to echo a $_POST and I get an error, here is the code:
5 Answers
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Mimicking sets in JavaScript?
I'm working in JavaScript. I'd like to store a list of unique , unordered string values, with the following properties:
7 ...
What are the different usecases of PNG vs. GIF vs. JPEG vs. SVG?
When should certain image file types be used when building websites or interfaces, etc?
13 Answers
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Why do most fields (class members) in Android tutorial start with `m`?
...t camel case rules, but I'm confused with this m rule. What does it stand for? I'm a PHP developer. "We" use first letters of variables as indication of type, like 'b' for boolean, 'i' for integer and so on.
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