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

26 documented Misconceptions

ArithmeticPlusPrecedes — Java

Addition has higher precedence than string concatenation

ArrayAccessWithParentheses — Java

Parenthesis are used to access an element in an array

AssignCompares — Java

= compares two values

AssignCompares — Python

= compares two values

AssignmentNotExpression — Java

An assignment a=b is not an expression

CannotChainAttributeToObjectInstantiation — Python

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

CannotChainMemberAccesses — Java

Member accesses cannot be chained together

CannotChainMemberToConstructor — Java

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

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

ConditionalOperatorNotExpression — JavaScript

The conditional operator is not an expression

EqualityOperatorComparesObjectsValues — Java

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

EqualityOperatorComparesObjectsValues — JavaScript

The equality operator compares two objects' values

EqualityOperatorComparesOnlyTypes — JavaScript

The equality operator '==' compares only the types of the operands

MapToBooleanWithConditionalOperator — Java

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

MapToBooleanWithTernaryOperator — Python

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

NoAtomicExpression — Java

Expressions must consist of more than one piece

NoAtomicExpression — JavaScript

Expressions must consist of more than one piece

NoAtomicExpression — Python

Expressions must consist of more than one piece

NoShortCircuit — Java

&& and || always evaluate both operands

NoShortCircuit — Python

and/or always evaluate both operands

NoSingleLogicAnd — Java

& is only a bitwise AND

PlusConcatenatesNumbers — Python

The plus operator can concatenate strings and numbers

PreIncrementBeforeLoop — Java

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

RightToLeftChaining — Java

Chained accesses are invoked from right to left

StringPlusStringifiesExpression — Java

String concatenation stringifies non-String operand expressions