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What optimizations can GHC be expected to perform reliably?
...hy are you worrying about it?)
Case expressions
Consider the following:
foo (0:_ ) = "zero"
foo (1:_ ) = "one"
foo (_:xs) = foo xs
foo ( []) = "end"
The first three equations all check whether the list is non-empty (among other things). But checking the same thing thrice is wasteful. Fortunate...
Indenting #defines
..., you'll eventually end up with even weirder looking code.
#if COND1
void foo() {
#if COND2
int i;
#if COND3
i = someFunction()
cout << i << eol;
#endif
#endif
}
#endif
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...
jsonify a SQLAlchemy result set in Flask [duplicate]
... return [value.strftime("%Y-%m-%d"), value.strftime("%H:%M:%S")]
class Foo(db.Model):
# ... SQLAlchemy defs here..
def __init__(self, ...):
# self.foo = ...
pass
@property
def serialize(self):
"""Return object data in easily serializable format"""
ret...
How to redirect all HTTP requests to HTTPS
...7), but this has issues for me on certain URLs. For example, http://server/foo?email=someone%40example.com redirects to https://server/foo?email=someone%2540example.com i.e. the "@" sign gets URL-quoted twice. Using the method in @ssc's answer does not have this issue.
– psmear...
What are type lambdas in Scala and what are their benefits?
...ist at value level.
The following example might help:
// VALUE LEVEL
// foo has signature: (String, String) => String
scala> def foo(x: String, y: String): String = x + " " + y
foo: (x: String, y: String)String
// world wants a parameter of type String => String
scala> def world(...
How do you run a crontab in Cygwin on Windows?
...te editor):
$ crontab -e # edit your user specific cron-table HOME=/home/foo
PATH=/usr/local/bin:/usr/bin:/bin:$PATH
# testing - one per line
* * * * * touch ~/cron
@reboot ~/foo.sh
45 11 * * * ~/lunch_message_to_mates.sh
Domain users: it does not work. Poor cron is unable to run scheduled...
Is it a bad practice to use an if-statement without curly braces? [closed]
...tation and so have no way of separating this:
if(one)
if(two)
foo();
else
bar();
From this:
if(one)
if(two)
foo();
else
bar();
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Find files containing a given text
...rkowski This way fastest more than 5 or 8 times # egrep -ir --include=file.foo "(foo|bar)" /dir on ~500Gb weigth directory.
– Qh0stM4N
Jan 24 '18 at 13:55
...
Really Cheap Command-Line Option Parsing in Ruby
...nd chmod it +x:
$ ./test
./test: Quiet= Interactive=, ARGV=[]
$ ./test -q foo
./test: Quiet=true Interactive=, ARGV=["foo"]
$ ./test -q -i foo bar baz
./test: Quiet=true Interactive=true, ARGV=["foo", "bar", "baz"]
$ ./test -q=very foo
./test: Quiet=very Interactive=, ARGV=["foo"]
See ruby -h for...
Linux command to list all available commands and aliases
...ter solution to the problem then the call to grep. So you can do type -a foo and if foo isn't available it returns command not found or something like that. So you are able to check for a command without calling the command itself.
– Janusz
Jun 4 '09 at 0:41
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