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Given a class, see if instance has method (Ruby)
...s ONLY methods that you defined explicitly with:
def my_method
end
then read this:
In Ruby, a property (attribute) on your model is basically a method also. So method_defined? will also return true for properties, not just methods.
For example:
Given an instance of a class that has a String at...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...s behavior.
Figure 1. Blocks for an App Inventor app that automatically reads the text message aloud when a new message arrives.
Figure 1 shows the blocks of a sample app that automatically reads the text messages aloud when a new text message arrives. Instead of implementing the event listeners...
When should static_cast, dynamic_cast, const_cast and reinterpret_cast be used?
...ple objects of the same type in the inheritance hierarchy (the so-called 'dreaded diamond') and you aren't using virtual inheritance. It also can only go through public inheritance - it will always fail to travel through protected or private inheritance. This is rarely an issue, however, as such for...
How does lucene index documents?
I read some document about Lucene; also I read the document in this link
( http://lucene.sourceforge.net/talks/pisa ).
4 An...
How to check the version before installing a package using apt-get?
...ted,
so don't depend on the relevance to the real current situation!
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
libjemalloc1 redis-tools
The following NEW packages will be installed:
libjem...
Why shouldn't I use “Hungarian Notation”?
...ple use Hungarian notation in a wrong way and are getting wrong results.
Read this excellent article by Joel Spolsky: Making Wrong Code Look Wrong.
In short, Hungarian Notation where you prefix your variable names with their type (string) (Systems Hungarian) is bad because it's useless.
Hungaria...
size_t vs. uintptr_t
...ns that, logically, size_t should be able to hold any pointer type. I've read on some sites that I found on the Googles that this is legal and/or should always work:
...
What are allowed characters in cookies?
...
@bobince - I know this is old, but am I reading your answer correctly to mean that spaces are not technically allowed in cookie values? "excluding semi-colon, comma and white space" [emphasis mine]
– Adam Rackis
Feb 8 '13 at 3...
val-mutable versus var-immutable in Scala
... because you need to store the resulting collection somewhere. If you only read from immutable collections, then use vals.
In general, make sure that you don't confuse references and objects. vals are immutable references (constant pointers in C). That is, when you use val x = new MutableFoo(), you...
List or IList [closed]
...hances you will ever write your own IList that adds anything to the ones already in the .NET framework are so remote that it's theoretical jelly tots reserved for "best practices".
Obviously if you are being asked which you use in an interview, you say IList, smile, and both look pleased at yours...