Wolfram Language & System 10.4 (2016)|Legacy Documentation

This is documentation for an earlier version of the Wolfram Language.View current documentation (Version 11.2)

Atomic Elements of Expressions

All expressions in the Wolfram Language are ultimately built from a small number of distinct types of atomic elements.


AtomQ test whether an expression is an atom

Head find the head of any expression, including an atom

Symbols »

Symbol the head of a symbol; create a symbol from a name

SymbolName  ▪  Context  ▪  Remove  ▪  Names  ▪  NameQ  ▪  ...

Strings »

String the head of a string

StringQ  ▪  Characters  ▪  ToCharacterCode  ▪  StringLength  ▪  ToExpression  ▪  ...

Numbers »

Integer  ▪  Real  ▪  Rational  ▪  Complex

NumberQ test for a number of any type

IntegerDigits  ▪  RealDigits  ▪  Precision  ▪  MachineNumberQ  ▪  ...