Boolean

A Boolean value is a truth value and can be used as a condition.

Related concepts:  ValueTypeConditional

Closest Wikipedia entry:  Boolean data type — In computer science, the Boolean (sometimes shortened to Bool) is a data type that has one of two possible values (usually denoted true and false) which is intended to represent the two truth values of logic and Boolean algebra. It is named after George Boole, who first defined an algebraic system of logic in the mid 19th century. The Boolean data type is primarily associated with conditional statements, which allow different actions by changing control flow depending on whether a programmer-specified Boolean condition evaluates to true or false.

Misconceptions about Boolean

12 documented Misconceptions

CompareBooleanToConstant — Scratch

To test whether an expression evaluates to true or false, one must compare it to a constant

ComparisonWithBoolLiteral — Python

To test whether an expression is True or False, one must compare it to True or to False

ComparisonWithBooleanLiteral — Java

To test whether an expression is true or false, one must compare it to true or to false

MapToBooleanWithConditionalOperator — Java

To map a boolean expression to a boolean, a conditional operator is necessary

MapToBooleanWithIf — Java

To map a boolean expression to a boolean, an if statement is necessary

MapToBooleanWithIf — Python

To map a boolean expression to a bool, an if statement is necessary

MapToBooleanWithTernaryOperator — Python

To map a boolean expression to a bool, a ternary conditional operator is necessary

NoShortCircuit — Java

&& and || always evaluate both operands

NoShortCircuit — Python

and/or always evaluate both operands

NoSingleLogicAnd — Java

& is only a bitwise AND

NumericToBooleanCoercion — Java

Numeric types can be coerced to boolean

ReferenceToBooleanCoercion — Java

Every reference type can be coerced to boolean