Ruby Define Constant Dynamically

But for those which need to be initialized to an empty array i do the following.

Ruby define constant dynamically.

A ruby constant is used to store a value for the duration of a ruby program s execution. This will produce the following result value of first constant is 100 value of second constant is 200 ruby pseudo variables. I have a class api that pulls objects from a third party api and builds them into objects that are subclasses of type apiobject. They can only be defined outside of methods unless you use metaprogramming.

Here var1 and var2 are constants. You cannot assign any value to these variables. Let s define parent to be that qualifying class or module object that is billing in the example above. Myconstant hello hello unlike other programming languages ruby.

Every predefined variable has its own specification. It s not through hash it s array access operator. What is a constant in ruby. The constant is looked up in the parent and its ancestors.

It will define a new method on the metaclass of the o local variable constant or result of method call. The algorithm for qualified constants goes like this. Ruby contains a wide range of predefined variables. Constants are declared by beginning the variable name with a capital letter a common convention for declaring constants is to use uppercase letters for the entire name.

For two of them i use attr reader. Apiobject subclasses match the object names from the api that i m p. Kernel and basicobject are still checked though. Constants are used for values that aren t supposed to change but ruby doesn t prevent you from changing them.

Make instance variable accessible through hash in ruby. To implement it you need to define methods. They are special variables that have the appearance of local variables but behave like constants. Using ruby i want to dynamically create class level instance variables inside corresponding getters.

A constant is a type of variable which always starts with a capital letter. The final way of defining a method dynamically in ruby is using def or define method.