Operatior

Description

Example 
+

Add 
a + b will
give 30 
−

Subtract 
a  b will
give 10 
*

Multiply 
a * b will
give 200 
/

Divide 
b / a will
give 2 
%

Modulus − Get
Remainder 
b % a will
give 0 
**

Exponent −
Power 
a**b will
give 10 to the power 20 
= 
Simple
assignment operator, assigns values from right side operands to
left side operand. 
c = a + b
will assign the value of a + b into c 
+=

Add AND
assignment operator, adds right operand to the left operand and
assign the result to left operand. 
c += a is
equivalent to c = c + a 
=

Subtract AND
assignment operator, subtracts right operand from the left operand
and assign the result to left operand. 
c = a is
equivalent to c = c  a 
*=

Multiply AND
assignment operator, multiplies right operand with the left
operand and assign the result to left operand. 
c *= a is
equivalent to c = c * a 
/=

Divide AND
assignment operator, divides left operand with the right operand
and assign the result to left operand. 
c /= a is
equivalent to c = c / a 
%=

Modulus AND
assignment operator, takes modulus using two operands and assign
the result to left operand. 
c %= a is
equivalent to c = c % a 
**=

Exponent AND
assignment operator, performs exponential (power) calculation on
operators and assign value to the left operand. 
c **= a is
equivalent to c = c ** a 
= 
Simple
assignment operator, assigns values from right side operands to
left side operand. 
c = a + b
will assign the value of a + b into c 
+=

Add AND
assignment operator, adds right operand to the left operand and
assign the result to left operand. 
c += a is
equivalent to c = c + a 
=

Subtract AND
assignment operator, subtracts right operand from the left operand
and assign the result to left operand. 
c = a is
equivalent to c = c  a 
== 
Checks if the
value of two operands are equal or not, if yes then condition
becomes true. 
(a == b) is
not true. 
=== 
Used to test
equality within a when clause of a case statement. 
(1...10) ===
5 returns true. 
!=

Checks if the
value of two operands are equal or not, if values are not equal
then condition becomes true. 
(a != b) is
true. 
>

Checks if the
value of left operand is greater than the value of right operand,
if yes then condition becomes true. 
(a > b) is
not true. 
<

Checks if the
value of left operand is less than the value of right operand, if
yes then condition becomes true. 
(a < b) is
true. 
>=

Checks if the
value of left operand is greater than or equal to the value of
right operand, if yes then condition becomes true. 
(a >= b)
is not true. 
<=

Checks if the
value of left operand is less than or equal to the value of right
operand, if yes then condition becomes true. 
(a <= b)
is true. 
<=>

Combined
comparison operator. Returns 0 if first operand equals second, 1
if first operand is greater than the second and 1 if first
operand is less than the second. 
(a <=>
b) returns 1. 
.eql?

True if the
receiver and argument have both the same type and equal values. 
1 == 1.0
returns true, but 1.eql?(1.0) is false. 
equal?

True if the
receiver and argument have the same object id. 
if aObj is
duplicate of bObj then aObj == bObj is true, a.equal?bObj is false
but a.equal?aObj is true. 
=> 
Hashmap
literal definition 
key1 =>
value1 
&

Binary AND
Operator copies a bit to the result if it exists in both operands.

(a & b)
will give 12, which is 0000 1100 


Binary OR
Operator copies a bit if it exists in either operand. 
(a  b) will
give 61, which is 0011 1101 
^

Binary XOR
Operator copies the bit if it is set in one operand but not both.

(a ^ b) will
give 49, which is 0011 0001 
~

Binary Ones
Complement Operator is unary and has the effect of 'flipping'
bits. 
(~a ) will
give 61, which is 1100 0011 in 2's complement form due to a
signed binary number. 
<<

Binary Left
Shift Operator. The left operands value is moved left by the
number of bits specified by the right operand. 
a << 2
will give 240, which is 1111 0000 
>>

Binary Right
Shift Operator. The left operands value is moved right by the
number of bits specified by the right operand. 
a >> 2
will give 15, which is 0000 1111 
?
: 
Conditional
Expression 
If Condition
is true ? Then value X : Otherwise value Y 
..

Creates a
range from start point to end point inclusive. 
1..10 Creates
a range from 1 to 10 inclusive. 
...

Creates a
range from start point to end point exclusive. 
1...10
Creates a range from 1 to 9. 
=~ 
matches a
String against a regular expression, returns the position/index if
found else nil 
"Hello World"
=~ /Wo/ 
!~ 
'Does not
contain� 
"Hello World"
!~ /Mo/ 