Logical operators

Learn how to use and combine different logical operators in APL.

Logical (binary) operators

The following logical operators are supported between two values of the bool type:

These logical operators are sometimes referred-to as Boolean operators, and sometimes as binary operators. The names are all synonyms.

Operator name	Syntax	meaning
Equality	==	Returns true if both operands are non-null and equal to each other. Otherwise, false.
Inequality	!=	Returns true if either one (or both) of the operands are null, or they are not equal to each other. Otherwise, false.
Logical and	and	Returns true if both operands are true.
Logical or	or	Returns true if one of the operands is true, regardless of the other operand.