Learn Red by Ivo Balbaert

Author:Ivo Balbaert
Language: eng
Format: epub
Tags: COM051000 - COMPUTERS / Programming / General, COM051230 - COMPUTERS / Software Development and Engineering / General, COM083000 - COMPUTERS / Security / Cryptography
Publisher: Packt Publishing
Published: 2018-05-18T10:48:37+00:00

The does word

The simplest way to make your own function in Red is with the does word. Consider the following code:

;-- see Chapter06/do-does-has-func.red:

cls: does [ loop 100 [print newline] ] ; == func [][loop 100 [print newline]]

cls ; call function cls

The newline phrase is the character that prints a new line.

In the preceding example, we create a function called cls that clears the output screen by printing 100 blank lines when it is called as cls. It is a function (func), as we can see from the return value when defining cls. You use does when you need a function that has no arguments and no local variables.

=> Now answer question 2 from the Questions section.

An important distinction should be made between the following two kinds of variables:

Local variables, which are only known in the function body itself

Global variables, which are known in the function as well as outside of it

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