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An expression is a single value or set of values, or a combination of several values through an operator such as addition or multiplication, or through a function call to functions such as the sine function or the averaging function.

Expressions belong to specific *data classes*, such as scalar,
string, or array, and their value can be stored in a variable.

• Variables: | Variables in LUX | |

• Data Classes: | Classes of data available in LUX | |

• Operators: | Basic arithmetic and more | |

• Function Call: | How to use functions | |

• Precedence: | Order of precedence |