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 Equality9 documented Misconceptions
Check YourselfAssignCompares — Java
= compares two valuesAssignCompares — Python
= compares two valuesComparisonWithBoolLiteral — Python
To test whether an expression is True or False, one must compare it to True or to FalseComparisonWithBooleanLiteral — Java
To test whether an expression is true or false, one must compare it to true or to falseEqualityOperatorComparesObjectsValues — Java
o==p compares the objects referred to by variables o and pEqualityOperatorComparesObjectsValues — JavaScript
The equality operator compares two objects' valuesEqualityOperatorComparesOnlyTypes — JavaScript
The equality operator '==' compares only the types of the operandsEqualsComparesReferences — Java
o.equals(p) compares the references stored in the variables o and pNullAndUndefinedAreTheSame — JavaScript
The values null and undefined are the same