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.
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.
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
- Step 1: Enable Developer Tab. …
- Step 2: Open The Visual Basic Editor (VBE) …
- Step 3: Find A Macro. …
- Step 4: Decide The Scope For Your Macro. …
- Step 5: Insert The Macro. …
- Step 6: Run The Macro. …
- Side Notes.
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 …) .
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 .
|Macro is Preprocessed||Function is Compiled|
|No Type Checking is done in Macro||Type Checking is Done in Function|