Booleans

Pointless includes boolean (true and false) values, which let us write code that performs logical calculations.

See the standard library Bool module for built-in functions for working with boolean values.

Syntax

In Pointless, booleans are accessible through keywords.

true
false

Operators

Pointless provides the following operators for constructing logical expressions.

true and false -- Logical "and", true when both operands are true
true or false -- Logical "or", true when either operand is true
not true -- Logical "not", true when operand is false

false
true
false

Short Circuiting

Note that the and and or operators are short circuiting, meaning that they only evaluate their second (right-hand) operand if the result of the expression cannot be determined by the initial (left-hand) operand.

fn isPositive(n)
  print("ran isPositive")
  n >= 0
end

fn isWhole(n)
  print("ran isWhole")
  n % 1 == 0
end

-- First operand is false so the second won't be evaluated
isPositive(-1) and isWhole(-1)

ran isPositive
false

-- First operand is true so both operands are evaluated
isPositive(1.5) and isWhole(1.5)

ran isPositive
ran isWhole
false