What is a macro in Racket?

Last Updated: March 13, 2022 by Racket Source Editor

A macro is a syntactic form with an associated transformer that expands the original form into existing forms. To put it another way, a macro is an extension to the Racket compiler. … Like many languages, Racket provides pattern-based macros that make simple transformations easy to implement and reliable to use.

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Also, what is a macro in scheme?

A macro is a symbol that has a transformer procedure associated with it. When Scheme encounters a macro-expression — i.e., a form whose head is a macro —, it applies the macro’s transformer to the subforms in the macro-expression, and evaluates the result of the transformation.

Moreover, what is macro give example? Macro is defined as something that covers a large amount, or is large in size. An example of macro is the study of the key driving aspects of an economy; macro economics. An example of macro is a very close up photograph of an ant; a macro photograph.

In this regard, when should I use macros elixir?

In Elixir, macros are used to define things that would be keywords in other languages: defmodule , def , defp , defmacro , and defmacrop are all macros defined by the standard library in Kernel .

How do you implement macros?

How To Use Macros You Find Online In 6 Easy Steps

  1. Step 1: Enable Developer Tab. …
  2. Step 2: Open The Visual Basic Editor (VBE) …
  3. Step 3: Find A Macro. …
  4. Step 4: Decide The Scope For Your Macro. …
  5. Step 5: Insert The Macro. …
  6. Step 6: Run The Macro. …
  7. Side Notes.

4 Related Question Answers Found

How do you unquote in a scheme?

To make it easier to write quasiquoted expressions, Scheme provides a little syntactic sugar. Just as you can use a single quote character and write ‘(foo bar baz) instead of (quote (foo bar baz) , you can use a backquote character ( ` ) to replace (quote …) and a comma character ( , ) to replace (unquote …) .

Which language first introduced the define keyword for macros?

Early Lisp

What is macro explain?

A macro is an automated input sequence that imitates keystrokes or mouse actions. A macro is typically used to replace a repetitive series of keyboard and mouse actions and used often in spreadsheets and word processing applications like MS Excel and MS Word. The file extension of a macro is commonly .

What is difference between macro and function?

Macros are

Macro Function
Macro is Preprocessed Function is Compiled
No Type Checking is done in Macro Type Checking is Done in Function

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