Java: Java Programming For Beginners a simple Start To Java Programming (Written By a software Engineer)

Logical Operators
Three logical operators are available for use in JavaScript namely, Not (!), Or (||) and And
(&&).  The  results  of  operations  that  involve  these  operators  are  Boolean  (true  or  false).
The results of these operations are computed in accordance with the following:
AND (&&) Binary operator
Both the conditions must be true
OR (||)
Binary operator
At least one of the conditions must be true
NOT (!)
Unary operator
The value of the condition determined is complemented.
For example,
‘Red’ != ‘Blue’ && 5 > 1 = ‘true’
‘Red’ != ‘Blue’ && 5 < 1 = ‘false’
‘Red’ == ‘Blue’ && 5 < 1 = ‘false’
For  conditional  operators,  JavaScript  uses  short-circuit  evaluation.  In  other  words,  if  the
value  of  the  first  condition  is  computed  to  be  ‘false’,  the  system  does  not  evaluate  the
other condition and directly presents the result.