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What's the point of map in Haskell, when there is fmap?
... the GHC.Base source code, the map function is implemented as follows
map _ [] = []
map f (x:xs) = f x : map f xs
which makes use of pattern matching to pull the head (the x) off the tail (the xs) of the list, then constructs a new list by using the : (cons) value constructor so to prepend f ...
Where can I find my .emacs file for Emacs running on Windows?
...:
Where do I put my init file?
On Windows, the .emacs file may be called _emacs for backward compatibility with DOS and FAT filesystems where filenames could not start with a dot. Some users prefer to continue using such a name, because Windows Explorer cannot create a file with a name starting w...
How to change the default charset of a MySQL table?
...lumns to a new character set, use a statement like this:
ALTER TABLE tbl_name CONVERT TO CHARACTER SET charset_name;
So query will be:
ALTER TABLE etape_prospection CONVERT TO CHARACTER SET utf8;
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How to recover a dropped stash in Git?
...ash commit you dropped, you can apply it as a stash:
git stash apply $stash_hash
Or, you can create a separate branch for it with
git branch recovered $stash_hash
After that, you can do whatever you want with all the normal tools. When you’re done, just blow the branch away.
Finding the hash
If ...
How to get a subset of a javascript object's properties
...ctions.
For example pick() would be exactly what you seek:
var subset = _.pick(elmo, ['color', 'height']);
fiddle
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Conditions for automatic generation of default/copy/move ctor and copy/move assignment operator?
...t copy won't modify it's target but move does?
– RaGa__M
Jul 5 '17 at 7:47
...
Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...装一下过程中所依赖的一些rpm包
yum install -y tcl-devel libart_lgpl-devel libtool-ltdl-devel
2、关闭sendmail，并取消其开机启动
service sendmail stop
chkconfig sendmail off
3、配置编译环境，安装开发包组
yum groupinstall -y "Development Tools" "Developm...
Is ASCII code 7-bit or 8-bit?
...haracter Codes, 1874-1968" (samizdat copy at http://falsedoor.com/doc/ascii_evolution-of-character-codes.pdf) and then chase its references (many of which are not available online and may be hard to find even with access to a university library, I regret to say).
...
Explain the encapsulated anonymous function syntax
...unction (x, y) {
return x * y;
};
4- A named function expression func_name, assigned to the variable multiply:
var multiply = function func_name(x, y) {
return x * y;
};
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How do I replace NA values with zeros in an R dataframe?
...and only replaces the ones with missingness.
– Twitch_City
Jul 29 '15 at 16:14
3
And... if you ha...