Interesting ruby-Study notes 3

Ruby method

The method name starts with a lowercase letter and is used as a constant if you start with a capital letter ( this is odd )

Define a method with no parameters

def method_name    Expr. End

Define a method that has a parameter

def method_name (var1, var2)   expr. End

Set default values for parameters

def method_name (var1=value1, var2=value2)   expr. End

The invocation method is simple

Method_name 25, 30

return value It's a peculiar point .It's ruby. You can default to the value of the last statement as a return value such as

def test   i =   J = Ten   k = 0end

When this method is called, the last declared variable K is returned.

You can also return a value with a regular return statement

It is interesting to note that if you give more than two expressions, the array containing the values will be the return value. If the expression is not given, nil will be the return value

#!/usr/bin/ruby#-*-coding:utf-8-*-def Test   i =   j = k =   300return I, j, Kendvar = testputs var

Return

100200300

Variable number of parameters

#!/usr/bin/ruby#-*-coding:utf-8-*-def sample (*test)   puts "number of arguments #{test.length}" for   I in 0...test.length
   
    puts "parameter value is #{test[i]}"   endendsample "Zara", "6", "F" Sample "Mac", "Min", "M", "MCA"
   

Class method There's a strange default rule: When a method is defined outside a class, the method is marked as private by default. On the other hand, if the method is defined in a class, the default flag is public. Ruby alias statement

Alias method Name Method name alias global variable global variable

Although I really don't know what this is all about.。。。 The Ruby undef statement can also dynamically cancel the method definition ( not only does this feel like it's useless, it's best not to use）

Interesting ruby-Study notes 3