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What is the purpose of the reader monad?
... work in finance, you might design some complicated logic for pricing an asset (a derivative say), which is all well and good and you can do without any stinking monads. But then, you modify your program to deal with multiple currencies. You need to be able to convert between currencies on the fly....
How do I get the logfile from an Android device?
...lly do the following:
connect the device to the pc.
Check that I already setup my os for that particular device.
Open a terminal
Run adb shell logcat > log.txt
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Haskell: Where vs. Let
... editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
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Run a PostgreSQL .sql file using command line arguments
...
You have four choices to supply a password:
Set the PGPASSWORD environment variable. For details see the manual: http://www.postgresql.org/docs/current/static/libpq-envars.html
Use a .pgpass file to store the password. For details see the manual: http://www.postgresql....
Can someone explain the right way to use SBT?
I'm getting out off the closet on this! I don't understand SBT. There, I said it, now help me please.
4 Answers
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C# List of objects, how do I get the sum of a property
...eLine(DateTime.Now - time);
}
class Test
{
public int Property { get; set; }
}
My results with compiler optimizations off are:
00:00:00.0570370 : Sum()
00:00:00.0250180 : Foreach()
00:00:00.0430272 : For(...)
and for second test are:
00:00:00.1450955 : Sum()
00:00:00.0650430 : Foreach()
0...
How to write log to file
...nil {
log.Fatalf("error opening file: %v", err)
}
defer f.Close()
log.SetOutput(f)
log.Println("This is a test log entry")
Based on the Go docs, os.Open() can't work for log.SetOutput, because it opens the file "for reading:"
func Open
func Open(name string) (file *File, err error) O...
Creating a “logical exclusive or” operator in Java
...pecially useful if the second operand would results in an error.
e.g.
if (set == null || set.isEmpty())
// or
if (list != null && list.size() > 0)
However with XOR, you always have to evaluate the second operand to get the result so the only meaningful operation is ^.
...
how do I use UIScrollView in Interface Builder?
...manipulating it programmatically, I'm having trouble getting it to work by setting it up exclusively in Interface Builder.
...
How to change the background color of the options menu?
...arate item background, for example it will add borders to each item if you set such background (with borders)...
– user25
May 3 '18 at 19:53
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