Using Operators

To get started using operators in Ruby, follow these steps:

1. Enter this code in a new file, operators.rb:
   
   
   Quote:

   value = 3 puts value value = value + 3 #addition puts value value = value / 2 #division puts value value = value * 3 #multiplication puts value value = value ** 2 #exponentiation puts value

2. Save operators.rb.
3. Run operators.rb:

__________________
Prasanna Vignesh
MCPD | Web Developer

Ruby Operators

Ruby Operators Operator Description
[ ] Array reference
[ ]= Array element set
** Exponentiation
! Not
~ Complement
+ Unary plus
- Minus
* Multiply
/ Divide
% Modulo
+ Plus
- Minus
>> Right shift
<< Left shift
& Bitwise And
^ Bitwise exclusive Or (Xor)
| Regular Or

Comparison operators:

<= Less than or equal to
< Less than
> Greater than
>= Greater than or equal to

Equality and pattern match operators:

<=> Less than, equal to, greater than
== Equal to
=== Tests equality in a when clause of a case statement
!= Not equal to
=~ Regular expression pattern match
&& Logical And
|| Logical Or
.. Inclusive range
... Exclusive range
? Ternary if
: Else

Assignment

= Normal assign
%= Modulus and assign
/= Divide and assign
-= Subtract and assign
+= Add and assign
*= Multiply and assign
**= Exponent and assign
defined? True if symbol defined
not Logical negation
and Logical composition
or Logical composition

Statement modifiers

if
unless
while
until

begin/end Block expression

__________________
Prasanna Vignesh
MCPD | Web Developer

Working with Arrays

There are plenty of ways to work with data in Ruby. Next up is to store it in arrays. Arrays act as groups of variables, and you can access each variable in an array with an index number.

For example, to create an array, you use the [] operator like this:

array = [1, 2, 3]

This creates an array with three elements, 1, 2, and 3. You access those elements using an array index like this:

Note that the first element in the array corresponds to array index 0, not 1, and the second element is at index 1, the third at index 2, and so on. You can also assign values to arrays, using the array index:

As you know, Ruby variables can store text strings as well as numbers, and you can store both in arrays.

Here’s an example:

array = [“Hello”, “there”, “sweetie”, 1, 2, 3]

This creates an array filled with six elements, three of which are text and three of which are numbers:

__________________
Prasanna Vignesh
MCPD | Web Developer

Hi


Nice Prasanna. You doin a good job. It is so helpful for me. I know the HTML and now i want to upgrade my self, so i thinking about the ROR or PHP.
I think ROR has nice future. so i looking for the ROR.

thanks