Dynamically access any variable in an instance class

In this blog post, I will show you how to access any variable on an instance of an Apex class dynamically.

This is something useful when you want to make dynamic feature which are based on setting, especialy when doing ISV stuffs.

The code is as simple as below:

public class Employee {
    public String employeeId;
    public String firstname;
    public String lastname;
    public String username;
    public String profileUrl;

    public Object getValue(String variableName) {
        String jsonString = toJSON();
        Map<String, Object> untyped_instance;
        untyped_instance = 
            (Map<String, Object>)JSON.deserializeUntyped(jsonString);
        return untyped_instance.get(variableName);
    }
    
    public string toJSON() {
        return JSON.serialize(this);
    }
}

Example:

Employee emp = new Employee();
emp.employeeId = 'test';
emp.firstname = 'kevan';
emp.lastname = 'moothien';
emp.username = 'kevanmoothien';
emp.profileUrl = 'https://picsum.photos/200/300';

system.debug(emp.getValue('firstname')); // returns kevan

system.debug(emp.getValue('lastname')); // returns moothien

Here is a use case where this kind of integration can be used based on the above code.
Suppose you have to develop a custom related list lightning component which would be used on several layout. But on each layout, it has to display different columns.

To achieve this, we would think of different component and hardcoded variable. But, this can be done by simply having a Custom Metadata type to save the setting of each layout and the related list custom component can simply display the columns value dynamically using the above code based on the setting provided in the Lighting app builder.

Hope this is useful to you trailblazers.

Cheers :)

How can we efficiently generate a List of Id from a List of SObject structure with just one line of code?

Do you know how to get a list<Id> from a list<SObject>? Yes, doing a loop of the list of SObject and then put each record Id into another list or set. 

What if this was possible in just one line of code?

Infact, it is possible to write this in just one line of code. Don't believe me? Take a look below. 

Let say we have a list of contact records from which we only want to extract the list of record Ids.

Cheers