Ruby On Rails

Non-recursive def is_palindrome ( s ) s == s. reverse end Recursive def is_palindrome_r ( s ) if s. length < = 1 true els...

// character to ASCII value: use ? ?a # => 97 ?\n # => 10 // string to integer: use [] ' a '[ 0 ] # => 97 ...

Don't confuse object attributes and local variables. If you are accustomed to C++ or Java, you might forget this. The variable @my_var...

Character A character in Ruby truly is an integer. It is not a type of its own, as in Pascal, and is not the same as a string of length 1 ...

Many of Ruby's operators are similar or identical to those in C. Two notable exceptions are the increment and decrement operators ( ++...

The Ruby parser is complex and relatively forgiving. It tries to make sense out of what it finds instead of forcing the programmer into sl...

As we've seen, methods are typically used with simple class instances and variables by separating the receiver from the method with a p...