Equality

Equality determines whether two expressions have equivalent values.

Related concepts:  OperatorValue

Closest Wikipedia entry:  Equality (mathematics) — In mathematics, equality is a relationship between two quantities or, more generally two mathematical expressions, asserting that the quantities have the same value, or that the expressions represent the same mathematical object. The equality between A and B is written A = B, and pronounced A equals B. The symbol "=" is called an "equals sign".

Misconceptions about Equality

9 documented Misconceptions

AssignCompares — Java

= compares two values

AssignCompares — Python

= compares two values

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

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

EqualsComparesReferences — Java

o.equals(p) compares the references stored in the variables o and p

NullAndUndefinedAreTheSame — JavaScript

The values null and undefined are the same