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RVM is not working in ZSH
...and Rails development, so I use RVM quite a bit too. The problem is that I can't seem to get RVM to work in ZSH, and it's working fine in the default Bash shell:
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Why does PostgreSQL perform sequential scan on indexed column?
...urns more than approximately 5-10% of all rows in the table, a sequential scan is much faster than an index scan.
This is because an index scan requires several IO operations for each row (look up the row in the index, then retrieve the row from the heap). Whereas a sequential scan only requires ...
getenv() vs. $_ENV in PHP
...y are exactly the same, except that getenv will look for the variable in a case-insensitive manner. Most of the time it probably doesn't matter, but one of the comments on the documentation explains:
For example on Windows $_SERVER['Path'] is like you see, with the first letter capitalized, no...
How to display hidden characters by default (ZERO WIDTH SPACE ie. ​)
I just lost part of my weekend because of this ... joker - zero width space. I just used some snippets from google groups and didn't recognize that there are doubled characters, because Idea (11) didn't show them, which was causing problems with parsing config file of my app... I discovered it accid...
DESTDIR and PREFIX of make
...z would. It's commonly used with GNU stow via
./configure --prefix=/usr/local && make && sudo make install prefix=/usr/local/stow/foo
, which would install binaries in /usr/local/stow/foo/bin. By comparison,
make install DESTDIR=/usr/local/stow/foo
would install binaries in /us...
How to forward declare a C++ template class?
...n successfully compiles and run. Are you sure about what you are claiming? Can you provide a quote from the standard?
– olek stolar
Aug 14 at 16:56
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How do I update zsh to the latest version?
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If you have Homebrew installed, you can do this.
# check the zsh info
brew info zsh
# install zsh
brew install --without-etcdir zsh
# add shell path
sudo vim /etc/shells
# add the following line into the very end of the file(/etc/shells)
/usr/local/bin/zsh
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Understanding the ngRepeat 'track by' expression
...by expression of ng-repeat in angularjs works. The documentation is very scarce: http://docs.angularjs.org/api/ng/directive/ngRepeat
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jQuery .hasClass() vs .is()
...result:
http://jsperf.com/hasclass-vs-is-so
The is is multi-purpose, you can for example do is('.class'), is(':checked'), etc which means is has more to do where is hasClass is limited which only checks for a class being set or not.
Hence, hasClass should be faster if performance at any level is y...
How to make git-diff and git log ignore new and deleted files?
...amed files. When doing git diff or git-log I'd like to omit them, so I can better spot the modifications.
3 Answers
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