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ES6 class variable alternatives
... up the constructor with a bunch of declarations) it can be solved stylistically as well.
The way I view it, many class based languages have the constructor be a function named after the class name itself. Stylistically we could use that that to make an ES6 class that stylistically still makes sens...
Convert a list of objects to an array of one of the object's properties
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fantastic solution. I wanted to access the String "id" in my Object-List. Worked perfect List<String> somestringlist = myobjectlist.Select(x => x.id).ToList();
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Aggregate / summarize multiple variables per group (e.g. sum, mean)
...reshape2 package for this task:
require(reshape2)
df_melt <- melt(df1, id = c("date", "year", "month"))
dcast(df_melt, year + month ~ variable, sum)
# year month x1 x2
1 2000 1 -80.83405 -224.9540159
2 2000 2 -223.76331 -288.2418017
3 2000 3 -188.83930 -481.560...
Why is Java's Iterator not an Iterable?
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An iterator is stateful. The idea is that if you call Iterable.iterator() twice you'll get independent iterators - for most iterables, anyway. That clearly wouldn't be the case in your scenario.
For example, I can usually write:
public void iterateOver(Iterable<String&...
CS0120: An object reference is required for the nonstatic field, method, or property 'foo'
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It looks like you are calling a non static member (a property or method, specifically setTextboxText) from a static method (specifically SumData). You will need to either:
Make the called member static also:
static void setTextboxText(int resu...
Fluid width with equally spaced DIVs
I have a fluid width container DIV.
7 Answers
7
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Function for Factorial in Python
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@J82: The concept used here is called recursion ( en.wikipedia.org/wiki/Recursion_(computer_science) ) - a function calling itself is perfectly fine and often useful.
– schnaader
Nov 7 '14 at 10:06
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System.Data.SQLite Close() not releasing database file
...nce and for all, so here is what I've found so far.
What happens when you call SQLiteConnection.Close() is that (along with a number of checks and other things) the SQLiteConnectionHandle that points to the SQLite database instance is disposed. This is done through a call to SQLiteConnectionHandle....
Differences in string compare methods in C#
...therStringValue
Is not the same as stringValue.Equals().
The == operator calls the static Equals(string a, string b) method (which in turn goes to an internal EqualsHelper to do the comparison.
Calling .Equals() on a null string gets null reference exception, while on == does not.
Object.Referen...
Why does printf not flush after the call unless a newline is in the format string?
Why does printf not flush after the call unless a newline is in the format string? Is this POSIX behavior? How might I have printf immediately flush every time?
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