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, operators are constructs defined within programming languages which behave generally like functions, but which differ syntactically or semantically. Common simple examples include arithmetic (e.g. addition with +), comparison (e.g. "greater than" with >), and logical operations (e.g. AND, also written && in some languages). More involved examples include assignment (usually = or :=), field access in a record or object (usually .), and the scope resolution operator (often :: or .).

Misconceptions about Operator

28 documented Misconceptions

ArithmeticPlusPrecedes

Addition has higher precedence than string concatenation

ArrayAccessWithParentheses

Parenthesis are used to access an element in an array

AssignCompares

= compares two values

AssignmentNotExpression

An assignment a=b is not an expression

CannotChainMemberAccesses

Member accesses cannot be chained together

CannotChainMemberToConstructor

Method calls or field accesses cannot be chained to a constructor invocation

ComparisonWithBooleanLiteral

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

EqualityOperatorComparesObjectsValues

o==p compares the objects referred to by variables o and p

MapToBooleanWithConditionalOperator

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

NoAtomicExpression

Expressions must consist of more than one piece

NoShortCircuit

&& and || always evaluate both operands

NoSingleLogicAnd

& is only a bitwise AND

PreIncrementBeforeLoop

Pre-increment in update part of for loop means increment before loop body

RightToLeftChaining

Chained accesses are invoked from right to left

StringPlusStringifiesExpression

String concatenation stringifies non-String operand expressions