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Difference between Covariance & Contra-variance
... are properties of a mapping function that associates one member of a set with another. More specifically, a mapping can be covariant or contravariant with respect to a relation on that set.
Consider the following two subsets of the set of all C# types. First:
{ Animal,
Tiger,
Fruit,
Bana...
Why are trailing commas allowed in a list?
I am curious why in Python a trailing comma in a list is valid syntax, and it seems that Python simply ignores it:
5 Answer...
HtmlSpecialChars equivalent in Javascript?
Apparently, this is harder to find than I thought it would be. And it even is so simple...
16 Answers
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What's the best way to break from nested loops in JavaScript?
...follow
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edited Jan 4 '18 at 21:19
user2200891
answered Oct 8 '08 at 14:53
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How can I get file extensions with JavaScript?
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Newer Edit: Lots of things have changed since this question was initially posted - there's a lot of really good information in wallacer's revised answer as well as VisioN's excellent breakdown
Edit: Just because this is the accept...
How to get users to read error messages?
...enlightening error messages, but just click on the first button available with a shrug of frustration.
26 Answers
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Get number days in a specified month using JavaScript? [duplicate]
..., February is 2, etc). This is
// because we're using 0 as the day so that it returns the last day
// of the last month, so you have to add 1 to the month number
// so it returns the correct amount of days
function daysInMonth (month, year) {
return new Date(year, month, 0).getDate();
}
// Jul...
What is scaffolding? Is it a term for a particular platform?
Scaffolding, what is it? Is it a Rails-only thing?
7 Answers
7
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Is git good with binary files?
Is git good with binary files?
6 Answers
6
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How to organize a node app that uses sequelize?
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The short story
The trick in this case is not to initialize the model in the file but just to provide the necesary information for its initialization and let a centralized module take care of the models setup and instantiation.
So the steps are:
Have several Model files with...