# Class Reference

This page lists all the various class types in Math.js. Every top-level function is listed here and links to its detailed reference to other parts of the documentation.

## math

The "math" namespace contains the entire math.js functionality. All of the mathematical functions are available in the "math" namespace, and allow for inputs of various types.

- [Function reference](functions.md)
- [Constant reference](constants.md)


## Unit

Stores values for a scalar unit and its postfix. (eg `100 mm` or `100 kg`). Although the `Unit` class contains public functions documented as follows, using the following API directly is *not* recommended. Prefer using the functions in the "math" namespace wherever possible.

- [Overview](../datatypes/units.md)
- [Class API](classes/unit.md)


## Fraction

Stores values for a fractional number.

- [Overview](../datatypes/fractions.md)
- [Class API](https://github.com/infusion/Fraction.js/)

## BigNumber

Stores values for a arbitrary-precision floating point number.

- [Overview](../datatypes/bignumbers.md)
- [Class API](https://mikemcl.github.io/decimal.js/)


## Matrix

Two types of matrix classes are available in math.js, for storage of dense and sparse matrices. Although they contain public functions documented as follows, using the following API directly is *not* recommended. Prefer using the functions in the "math" namespace wherever possible.

- [Overview](../datatypes/matrices.md)
- [DenseMatrix](classes/densematrix.md)
- [SparseMatrix](classes/sparsematrix.md)

Classes used internally that may be of use to developers:

- [Index](classes/matrixindex.md)
- [Range](classes/matrixrange.md)
- [ResultSet](classes/matrixrange.md)
- [FibonacciHeap](classes/fibonacciheap.md)

## Complex

Stores values for a complex number.

- [Overview](../datatypes/complex_numbers.md)
- [Class API](https://github.com/infusion/Complex.js/)

## Parser

The Parser object returned by `math.parser()`.

- [Overview](../expressions/parsing.md)

## Node

A node in an expression-tree, which can be used to analyze, manipulate, and evaluate expressions.

- [Overview](../expressions/expression_trees.md)

`Node` is the base class of all other node classes:

- [AccessorNode](../expressions/expression_trees.md#accessornode)
- [ArrayNode](../expressions/expression_trees.md#arraynode)
- [AssignmentNode](../expressions/expression_trees.md#assignmentnode)
- [BlockNode](../expressions/expression_trees.md#blocknode)
- [ConditionalNode](../expressions/expression_trees.md#conditionalnode)
- [ConstantNode](../expressions/expression_trees.md#constantnode)
- [FunctionAssignmentNode](../expressions/expression_trees.md#functionassignmentnode)
- [FunctionNode](../expressions/expression_trees.md#functionnode)
- [IndexNode](../expressions/expression_trees.md#indexnode)
- [ObjectNode](../expressions/expression_trees.md#objectnode)
- [OperatorNode](../expressions/expression_trees.md#operatornode)
- [ParenthesisNode](../expressions/expression_trees.md#parenthesisnode)
- [RangeNode](../expressions/expression_trees.md#rangenode)
- [SymbolNode](../expressions/expression_trees.md#symbolnode)
- [UpdateNode](../expressions/expression_trees.md#updatenode)