Red Foundations: Difference between revisions
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(WORK IN PROGRESS)
A Red program is just a set of elements in a block. When not interpreted, elements can be in any order, when you evaluate the block, a set of rules are applied to interpret the block elements a data takes life in a program.▼
(Let's introduced manipulating block first, using RED Elements)
A Red program is just a set of elements in a container called a block. The code you create in your text editor, once loaded, it is inserted inside a block whose square braces are not visible.
Here is a simple program:
[Red [Tittle: {My Program}] a: 22 Probe a]
DO [Red [Tittle: {My Program}] a: 22 Probe a]
22
== 22
>>
Let's assign to the word my-program the above block of code
my-program: [Red [Tittle: {My Program}] a: 22 Probe a]
And run it
DO my-program
22
== 22
>>
The result is the same.
A block is composed of elements recognizable by Red interpreter. The above block is made of 6 elements:
probe length? my-program
== 6
>>
Let's print the first element
probe pick my-program/1
== Red
>>
Now, let's print the last element:
probe pick my-program/6
== a
>>
Or use a shortcut:
probe last my-program
== a
>>
We can modify the program to print 33 instead of 22:
change at my-program 4 33
Read it as: change (at my-program 4) 33
Run the code on the console:
>> change (at my-program 4) 33
== [Probe a]
>> probe my-program
[Red [Tittle: "My Program"] a: 33 Probe a]
== [Red [Tittle: "My Program"] a: 33 Probe a]
>>
And run the code:
>> do my-program
33
== 33
>>
Now the program has been changed and it outputs 33
----------------
You have the following bricks of Red Element in blocks:
Line 12 ⟶ 89:
code-to-execute: []
...
They can be in any order when stored but to be executed the order should follow some simple rules.
▲
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