What is the OR operator in Haskell?

Overview

The OR operator is used to evaluate two expressions. We can write a double pipe || to use the OR operator. It will return either a True or a False based on the conditions.

Syntax

expression1 || expression2

Return value

It returns a boolean value based on the given expressions.

Let's take a look at the truth table for OR.

The OR truth table

Expression 1

Expression 2

Result

False

False

False

False

True

True

True

False

True

True

True

True

From the table above, we can conclude that if any one of the expressions is evaluated as True, then the result will be True.

Let's take a look at an example of this.

Example

main::IO()
main = do
  print( 5<10 || 36<25 )

Explanation

In the above code snippet:

  • Line 4: We have two expressions, where the first expression evaluates to True while the second expression evaluates to False, and the OR operator returns True according to the above table.
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