Exchanging Values Without Using Temporary Variables

a = 1
b = 2
a, b = b, a
puts a                                 # => 2
puts b                                 # => 1

1.	Storing Data in Variables
2.	Define a variable to hold an integer
3.	give a value a name by assigning it to a variable
4.	variables can point to any kind of object
5.	Variables allow you to write and use programs that work upon varying data.
6.	variables can also be assigned the results of an expression
7.	Doing a calculation
8.	create a variable and compare it with a number.
9.	Exchange three value with using new variables
10.	Assign values to more than one variable in one statement
11.	Assign constant array value to three variables
12.	Exchange value with an extra variable
13.	Math calculation
14.	x, y = 1, 2 # Same as x = 1; y = 2
15.	Swap the value of two variables
16.	Array elements automatically assigned to variables
17.	understand the difference between numbers and digits.
18.	Variables in a Class
19.	Prefix and variable type
20.	Interpolation with two variables
21.	Everything Is an Object
22.	Objects Might Have Their Own Methods

Exchanging Values Without Using Temporary Variables : Variables « Language Basics « Ruby