Boolean
A boolean holds a true or false value and are mostly used in conditional statements to control a program’s flow of execution. This data type is named after George Boole, a 19th century English logician.
Some languages use comparison operators such as:
>=
and<=
, for “greater than” and “less than”, respectively.==
andis
or!=
andnot
to test for equality and inequality, respectively.
Other languages may use a combination of “falsy” values (e.g. ""
, null
, or 0
) and “truthy” values such as 1
.
JavaScript Example
The following example uses a comparison operator to return true
or false
based on the evaluation of the given statement. Then, a JavaScript conditional is used to determines whether the if
or else
code block will run: