How to resolve the algorithm Add a variable to a class instance at runtime step by step in the FBSL programming language

Published on 12 May 2024 09:40 PM
#Fbsl

How to resolve the algorithm Add a variable to a class instance at runtime step by step in the FBSL programming language

Table of Contents

Problem Statement

Demonstrate how to dynamically add variables to an object (a class instance) at runtime. This is useful when the methods/variables of an instance are based on a data file that isn't available until runtime. Hal Fulton gives an example of creating an OO CSV parser at An Exercise in Metaprogramming with Ruby. This is referred to as "monkeypatching" by Pythonistas and some others.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Add a variable to a class instance at runtime step by step in the FBSL programming language

Source code in the fbsl programming language

#APPTYPE CONSOLE

CLASS Growable
	
	PRIVATE:
	
	DIM instructions AS STRING = "Sleep(1)"
	:ExecCode
	DIM dummy AS INTEGER = EXECLINE(instructions, 1)
	
	PUBLIC:
	
	METHOD Absorb(code AS STRING)
		instructions = code
		GOTO ExecCode
	END METHOD
	
	METHOD Yield() AS VARIANT
		RETURN result
	END METHOD
	
END CLASS

DIM Sponge AS NEW Growable()

Sponge.Absorb("DIM b AS VARIANT = 1234567890: DIM result AS VARIANT = b")
PRINT Sponge.Yield()
Sponge.Absorb("b = ""Hello world!"": result = b")
PRINT Sponge.Yield()

PAUSE

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