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Converting a Date object to a calendar object [duplicate]
...er = new SimpleDateFormat("yyyyMMdd");
date = (Date)formatter.parse(date.toString());
DateFormat is used to convert Strings to Dates (parse()) or Dates to Strings (format()). You are using it to parse the String representation of a Date back to a Date. This can't be right, can it?
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What is the difference between Class and Klass in ruby?
...or defining classes while the latter is just an identifier (like any other string of characters). It's used when you would like to write the word "class" but can't because it's a reserved keyword.
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How to call an external command?
...cho $PATH by using call(["echo", "$PATH"]), but it just echoed the literal string $PATH instead of doing any substitution. I know I could get the PATH environment variable, but I'm wondering if there is an easy way to have the command behave exactly as if I had executed it in bash.
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Convert Year/Month/Day to Day of Year in Python
...number, you would have to convert it to int() because strftime() returns a string. If that is the case, you are better off using DzinX's answer.
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Remove an element from a Bash array
...$delete}
pippo
$ array=( "${array[@]/$delete}" ) #Quotes when working with strings
If need to delete more than one element:
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$ delete=(pluto pippo)
for del in ${delete[@]}
do
array=("${array[@]/$del}") #Quotes when working with strings
done
Caveat
This technique actually removes prefixes...
Confirm deletion in modal / dialog using Twitter Bootstrap?
...e row" link for each row, but I would like to confirm with the user beforehand.
12 Answers
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MySQL Cannot Add Foreign Key Constraint
...ing to add Foreign Key constraints to my database as a project requirement and it worked the first time or two on different tables, but I have two tables on which I get an error when trying to add the Foreign Key Constraints.
The error message that I get is:
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How to add an auto-incrementing primary key to an existing table, in PostgreSQL?
...e with existing data. Is there a way to add a primary key without deleting and re-creating the table?
4 Answers
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Swift compiler segmentation fault when building
...rgument.
protocol SomeProtocolName: class {
var someProtocolVariable: String { get set }
func someProtocolFunction(someProtocolVariable: String)
}
// MARK:
extension SomeProtocolName {
func someProtocolFunction(someProtocolVariable: String?) {
self.someProtocolVariable = someP...
Convert duration to hours:minutes:seconds (or similar) in Rails 3 or Ruby
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Ruby's string % operator is too unappreciated and oft forgotten.
"%02d:%02d:%02d:%02d" % [t/86400, t/3600%24, t/60%60, t%60]
Given t is a duration in seconds, this emits a zero-padded colon-separated string including days. Exampl...