► |  | Reference: Racket

1 | Language Model
2 | Syntactic Forms
3 | Datatypes
4 | Structures
5 | Classes and Objects
6 | Units
7 | Contracts
8 | Pattern Matching
9 | Control Flow
10 | Concurrency
11 | Macros
12 | Input and Output
13 | Reflection and Security
14 | Operating System
15 | Memory Management
16 | Unsafe Operations
17 | Running Racket
| Bibliography
| Index

▼ | 17 | Running Racket

17.1 | Running Racket or GRacket
17.2 | Libraries and Collections
17.3 | Interactive Help
17.4 | Interactive Module Loading
17.5 | Debugging

On this page:

enter!

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#### 17.4`` Interactive Module Loading

( require racket/enter )

The bindings documented in this section are provided by the racket/enter and racket/init libraries, which means that they are available when the Racket executable is started with no command-line arguments. They are not provided by racket/base or racket.

( enter! module-path)
( enter! #f)

Intended for use in a REPL, such as when mzscheme is started in interactive mode. When a module-path is provided (in the same sense as for require), the corresponding module is loaded or invoked, and the current namespace is changed to the body of the module via module->namespace. When #f is provided, then the current namespace is restored to the original one.

If invoking module-path requires loading any files, then modification dates of the files are recorded. If the file is modified, then a later enter! re-loads the module from source; see also Module Re-declarations. Similarly if a later enter! transitively requires a modified module, then the required module is re-loaded. Re-loading support works only for modules that are first loaded (either directly or indirectly through transitive requires) via enter!.

After switching namespaces to the designated module, enter! automatically requires racket/enter into the namespace, so that enter! can be used to switch namespaces again.

When it loads or re-loads a module from a file, enter! prints a message to ( current-error-port ).

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