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Why are side-effects modeled as monads in Haskell?
...etContents ~~~ putStrLn
without touching the real world.
"Impurification"
Now suppose we want to make the file content uppercase as well. Uppercasing is a pure function
upperCase :: String -> String
But to make it into the real world, it has to return an IO String. It is easy to lift such a fun...
How to use PyCharm to debug Scrapy projects
...a good Python debugger. I want to test my Scrapy spiders using it. Anyone knows how to do that please?
10 Answers
...
Node.js app can't run on port 80 even though there's no other process blocking the port
... Not sure why, but on Ubuntu 14.04 this did not work for me. I now use port forwarding via ssh, which is just as easy. I posted an answer below.
– panepeter
Feb 27 '18 at 9:12
...
How do I check that a number is float or integer?
...viding by 1:
function isInt(n) {
return n % 1 === 0;
}
If you don't know that the argument is a number you need two tests:
function isInt(n){
return Number(n) === n && n % 1 === 0;
}
function isFloat(n){
return Number(n) === n && n % 1 !== 0;
}
Update 2019
5 years a...
Error in strings.xml file in Android
...tring.xml for this char: '
than I added the escape char \ infront of it (now it looks like \' ) and still got the same error!
I searched again for the char ' and I replaced the char ' with \'(eng writing) , since it shows a right to left it looks like that '\ in the strings.xml !!
Problem solved...
The specified type member 'Date' is not supported in LINQ to Entities Exception
... Note that EntityFunctions is deprecated in EF6, you should now use DbFunctions.
– Julien N
Jan 8 '14 at 14:15
2
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Collisions when generating UUIDs in JavaScript?
...
Thanks, I'm going with uuid.js now, since it uses browser's strong crypto if available. Will see if there are any collisions.
– Muxa
Aug 31 '11 at 22:21
...
Tab key == 4 spaces and auto-indent after curly braces in Vim
...As has been pointed out in a couple of answers below, the preferred method now is NOT to use smartindent, but instead use the following (in your .vimrc):
filetype plugin indent on
" show existing tab with 4 spaces width
set tabstop=4
" when indenting with '>', use 4 spaces width
set shiftwidth=4...
How to move a file?
...folder to be sure the awesome.txt file I created exists. It is there :)
Now we have moved a folder and its files from a source to a destination and back again.
share
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How to avoid “cannot load such file — utils/popen” from homebrew on OSX
...ks! Though, changing permissions on /usr/local doesn't seem to be required now. "Homebrew no longer needs to have ownership of /usr/local. If you wish you can return /usr/local to its default ownership with: sudo chown root:wheel /usr/local"
– Bert
Nov 1 '16...