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Module

Module[{x, y, ...}, expr]
specifies that occurrences of the symbols x, y, ... in expr should be treated as local.

Module[{x=x₀, ...}, expr]
defines initial values for x, ....

MORE INFORMATION

Module allows you to set up local variables with names that are local to the module.

Module creates new symbols to represent each of its local variables every time it is called.

Module creates a symbol with name xxx$nnn to represent a local variable with name xxx. The number nnn is the current value of $ModuleNumber.

The value of $ModuleNumber is incremented every time any module is used.

Before evaluating expr, Module substitutes new symbols for each of the local variables that appear anywhere in expr except as local variables in scoping constructs.

Symbols created by Module carry the attribute Temporary.

Symbols created by Module can be returned from modules.

You can use Module[{vars}, body/;cond] as the right-hand side of a transformation rule with a condition attached.

Module has attribute HoldAll.

Module constructs can be nested in any way, with inner variables being renamed if necessary.

Module is a scoping construct that implements lexical scoping.

Basic Examples (1)

Click for copyable input

Applications (2)

Properties & Relations (8)

Possible Issues (3)

With Block DynamicModule Unique GeneratedParameters

Functions as Procedures

Modules and Local Variables

Variables in Pure Functions and Rules

Blocks Compared with Modules

Introduction to Dynamic

Attributes

Language Overview

Namespace Management

Package Bulletproofing

Package Development

Procedural Programming

Scoping Constructs

Demonstrations with Module (Wolfram Demonstrations Project)

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