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Check if at least two out of three booleans are true
... is impractical, and dare I say, useless. Micro-optimizations, when driven by the need, is guided by runtime profiling results, not human instincts (which are known to be terrible). You can certainly ask interviewees the process by which you'd optimize this further; that's more important than the re...
Linux command (like cat) to read a specified quantity of characters
...
head works too:
head -c 100 file # returns the first 100 bytes in the file
..will extract the first 100 bytes and return them.
What's nice about using head for this is that the syntax for tail matches:
tail -c 100 file # returns the last 100 bytes in the file
You can combin...
Purpose of “consider_all_requests_local” in config/environments/development.rb?
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How do I check that a number is float or integer?
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check for a remainder when dividing by 1:
function isInt(n) {
return n % 1 === 0;
}
If you don't know that the argument is a number you need two tests:
function isInt(n){
return Number(n) === n && n % 1 === 0;
}
function isFloat(n){
retu...
What is the meaning of the term “free function” in C++?
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Detect Chrome extension first run / update
... simple flag on first run, then when the current extension version (get it by XmlHttpRequesting the manifest) doesn't equal the one stored in localStorage, the extension has been updated.
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Difference between static class and singleton pattern?
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The true answer is by Jon Skeet, on another forum here.
A singleton allows access to a single
created instance - that instance (or
rather, a reference to that instance)
can be passed as a parameter to other
methods, and treated as a...
Unique constraint that allows empty values in MySQL
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Node: log in a file instead of the console
... as long as your arm. Many of the issues have had pull requests submitted by other users, but the project maintainers are not even taking the time to merge these. For alternatives node-bunyan and caterpillar might be worth looking at.
– UpTheCreek
Nov 22 '13 ...
Django fix Admin plural
...this property instead of re-inventing the wheel.
– cibyr
Mar 10 '14 at 3:33
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