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Safe (bounds-checked) array lookup in Swift, through optional bindings?
...pened to stumble on a nicer way of implementing this functionality:
Swift 3.2 and newer
extension Collection {
/// Returns the element at the specified index if it is within bounds, otherwise nil.
subscript (safe index: Index) -> Element? {
return indices.contains(index) ? self...
Express-js wildcard routing to cover everything under and including a path
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I think you will have to have 2 routes. If you look at line 331 of the connect router the * in a path is replaced with .+ so will match 1 or more characters.
https://github.com/senchalabs/connect/blob/master/lib/middleware/router.js
If you have 2 routes that perform the same action ...
Getting assembly name
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354
System.Reflection.Assembly.GetExecutingAssembly().GetName().Name
or
typeof(Program).Assembl...
Why git keeps showing my changes when I switch branches (modified,added, deleted files) no matter if
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143
Switching branches carries uncommitted changes with you. Either commit first, run git checkout ....
Insert text into textarea with jQuery
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edited Jun 3 '09 at 19:31
answered Jun 3 '09 at 19:22
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What is the easiest way to initialize a std::vector with hardcoded elements?
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edited Feb 10 '10 at 13:30
answered Feb 10 '10 at 11:00
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Relative frequencies / proportions with dplyr
...()) %>%
mutate(freq = n / sum(n))
# am gear n freq
# 1 0 3 15 0.7894737
# 2 0 4 4 0.2105263
# 3 1 4 8 0.6153846
# 4 1 5 5 0.3846154
From the dplyr vignette:
When you group by multiple variables, each summary peels off one level of the grouping. That makes it ea...
RegEx to parse or validate Base64 data
... the following:
^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$
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