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What's the difference between equal?, eql?, ===, and ==?
...reat explanations. I encourage you to read it, and also the documentation for these methods as they're overridden in other classes, like String.
Side note: if you want to try these out for yourself on different objects, use something like this:
class Object
def all_equals(o)
ops = [:==, :===, ...
Custom Compiler Warnings
...thod/property is obsolete and somthing else should be used. I'm currently working on a project that requires a lot of refactoring an ex-employees code. I want to write a custom attribute that I can use to mark methods or properties that will generate compiler warnings that give messages that I write...
GCC -g vs -g3 GDB Flag: What is the Difference?
When compiling C source code with either gcc or Clang, I always use the -g flag to generate debugging information for gdb.
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ssh: The authenticity of host 'hostname' can't be established
When i ssh to a machine, sometime i get this error warning and it prompts to say "yes" or "no". This cause some trouble when running from scripts that automatically ssh to other machines.
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How to negate a method reference predicate
In Java 8, you can use a method reference to filter a stream, for example:
12 Answers
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How can I combine two HashMap objects containing the same types?
...answered Nov 28 '10 at 23:26
a_horse_with_no_namea_horse_with_no_name
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Always pass weak reference of self into block in ARC?
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It helps not to focus on the strong or weak part of the discussion. Instead focus on the cycle part.
A retain cycle is a loop that happens when Object A retains Object B, and Object B retains Object A. In that situation, if either object is released:
Object ...
findViewById in Fragment
...which will refer to the ImageView element which I have created in the XML for the Fragment. However, the findViewById method only works if I extend an Activity class. Is there anyway of which I can use it in Fragment as well?
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Should I embed images as data/base64 in CSS or HTML
...Are there some reasons to avoid this?
It's a good practice usually only for very small CSS images that are going to be used together (like CSS sprites) when IE compatibility doesn't matter, and saving the request is more important than cacheability.
It has a number of notable downsides:
Doesn't...
How can I run code on a background thread on Android?
...ackground Thread
execute code that DOES NOT touch/update the UI
execute (short) code which will take at most a few seconds to complete
THEN use the following clean and efficient pattern which uses AsyncTask:
AsyncTask.execute(new Runnable() {
@Override
public void run() {
//TODO your...