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How do RVM and rbenv actually work?
...nv ruby, your operating system will find ~/.rbenv/shims/ruby first and run it instead of any other ruby executable you may have installed.
Each shim is a tiny Bash script that in turn runs rbenv exec. So with rbenv in your path, irb is equivalent to rbenv exec irb, and ruby -e "puts 42" is equivale...
Nginx no-www to www and www to no-www
... your config file
# example
location / {
rewrite ^/cp/login?$ /cp/login.php last;
# etc etc...
}
}
Note: I have not originally included https:// in my solution since we use loadbalancers and our https:// server is a high-traffic SSL payment server...
Android custom dropdown/popup menu
...
Update: To create a popup menu in android with Kotlin refer my answer here.
To create a popup menu in android with Java:
Create a layout file activity_main.xml under res/layout directory which contains only one button.
Filename: activity_main.xml
<RelativeLayou...
Invalidating JSON Web Tokens
For a new node.js project I'm working on, I'm thinking about switching over from a cookie based session approach (by this, I mean, storing an id to a key-value store containing user sessions in a user's browser) to a token-based session approach (no key-value store) using JSON Web Tokens (jwt).
...
When should I use malloc in C and when don't I?
...mewhere in the read-only part of the memory and you just have a pointer to it. You can use the string as read-only. You cannot make changes to it. Example:
some_memory[0] = 'h';
Is asking for trouble.
On the other hand
some_memory = (char *)malloc(size_to_allocate);
is allocating a char arra...
How to print a number with commas as thousands separators in JavaScript
I am trying to print an integer in JavaScript with commas as thousands separators. For example, I want to show the number 1234567 as "1,234,567". How would I go about doing this?
...
How fast is D compared to C++?
I like some features of D, but would be interested if they come with a
runtime penalty?
8 Answers
...
Add legend to ggplot2 line plot
... I managed to plot three lines in the same graph and want to add a legend with the three colors used. This is the code used
...
Same-named attributes in attrs.xml for custom view
I'm writing a few custom views which share some same-named attributes. In their respective <declare-styleable> section in attrs.xml I'd like to use the same names for attributes:
...
In Visual Studio C++, what are the memory allocation representations?
...es after allocated heap memory
* 0xABADCAFE : A startup to this value to initialize all free memory to catch errant pointers
* 0xBAADF00D : Used by Microsoft's LocalAlloc(LMEM_FIXED) to mark uninitialised allocated heap memory
* 0xBADCAB1E : Error Code returned to the Microsoft eVC debugger when con...