Rails Articles February 27th, 2008
- Here Documents in strings
Here documents are nothing but strings that are inherently multiline.
- str=<<EOF
Raghu is giving a presenation,
he know ruby very well.
EOF
- Here documents can also be stacked into a method like
def foobar(<<str1,<<str2,<<str3)
This is a cool thing
And this is great.
str1
This is the second cool thing
and it is also great
str2
This is third cool thing
and now its becoming hot
str3
end
- String Compression:
The zlib library provides means for compressing and decompressing strings and files mailt faster db access,to optimize the network or may be obscure
the strings so that they are not possibly readable
The Deflate and Inflate classes have the methods defalte and inflate for ths purpose.The deflate takes parameter whch defines the quality of compression and speed
BEST COMPRESSION-results in a smallest compressed string
BEST SPEED- Compresse faster buts does not compress as much
DEFAULT COMPRESSION-Provides a tradeoff between
- -How does method invocation takes place in ruby on rails?
For example: myobject.method
-Ruby first searches for singleton methods of myobject
-Then it defines the myobject class
-Then the methods defined in the myobjects ancestors
In case if the mymethod is not found,ruby seraches the default method called method_missing
- - Methods without parenthesis are valid in ruby.
For example: foobar a,b,c
- -There are no boolean types in Ruby.Instead there is the TRuecalss and the Falseclass with its instance as true an false
- -loop is not a keyword instead its a method defined into the kernel module
- -what is the differenece .. and… in ranges?
..is inclusive of the upper bound and the … is not exclusove of the upper bound.ex5..10 will consider 10 but …will not consider 10
- what kind of a scope does the intialize method of a class have?
-The intialize method is always private
- The methods ending with an ! mark are said to be destructive methods.These are said to destructive since these methods tend to modify the behaviour of the receiver i.e the receiver will not hold the values before it was applied to this method.
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