Type

A type is a set of values supporting a certain set of operations.

Related concepts:  ValueClass

Closest Wikipedia entry:  Type system — In computer programming, a type system is a logical system comprising a set of rules that assigns a property called a type (for example, integer, floating point, string) to every term (a word, phrase, or other set of symbols). Usually the terms are various language constructs of a computer program, such as variables, expressions, functions, or modules. A type system dictates the operations that can be performed on a term.

Misconceptions about Type

38 documented Misconceptions

CharType

A single character is of type char

ClassDefinesType

The type of an object is equivalent to the type defined by its class definition

EqualityOperatorComparesOnlyTypes

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

NullAndUndefinedAreTheSame

The values null and undefined are the same

TypeofArrayIsArray

The typeof operator applied on an array returns 'array'

TypeofNullIsNull

The value null is of type 'null'