Operator

An operator is a symbol or keyword in source code that represents a built-in function.

Related concepts:  Function

Closest Wikipedia entry:  Operator (computer programming) — In computer programming, an operator is a programming language construct that provides functionality that may not be possible to define as a user-defined function (i.e. sizeof in C) or has syntax different than a function (i.e. infix addition as in a+b). Like other programming language concepts, operator has a generally accepted, although debatable meaning among practitioners while at the same time each language gives it specific meaning in that context, and therefore the meaning varies by language. Some operators are represented with symbols – characters typically not allowed for a function identifier – to allow for presentation that is more familiar looking than typical function syntax.

Misconceptions about Operator

28 documented Misconceptions

AssignCompares

= compares two values

CannotChainAttributeToObjectInstantiation

Method calls, and attribute accesses in general, cannot be chained to a constructor invocation.

ComparisonWithBoolLiteral

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

MapToBooleanWithTernaryOperator

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

NoAtomicExpression

Expressions must consist of more than one piece

NoShortCircuit

and/or always evaluate both operands

PlusConcatenatesNumbers

The plus operator can concatenate strings and numbers