# Language - Expression

### Table of Contents

## About

An Expression is a suite of special token that:

- are contained in statements
- and produce value (evaluate)

They are a value specifications that specify values resulting from a computation.

The expression execution order is determined by control-flow statements like if and for.

An expression is any reference to a variable or value, or a set of variable( s) and value( s) combined with operators.

## Articles Related

## Component

## List

- Mathematics Expression
- …

- expression statement: a general expression that stands alone, generally it's used as a call expression statement to call a Function.

## Example

`a = b * 2; `

This statement has four expressions in it:

- 2 is a literal value expression.
- b is a variable expression, which means to retrieve its current value.
- b * 2 is an arithmetic expression, which means to do the multiplication.
- a = b * 2 is an assignment expression, which means to assign the result of the b * 2 expression to the variable a.

## Documentation / Reference

- Unified Modeling Language (UML) - 2.5.1 - chapter 8.3