RAD2 JSON demo (static vs. non-static methods)

gistfile1.txt

//get a Contact
Contact c = [
    SELECT Id, Name, AccountId, Account.Name, Email, Phone
    FROM Contact 
    LIMIT 1
];

// METHOD SIGNATURE
// public static String serializePretty(Object objectToSerialize, Boolean suppressApexObjectNulls)

// NOTE: the signature says it's a static method, so that means you use it by
// calling the name of the class (JSON) and providing the variable name as the method argument

String jsonString = JSON.serializePretty(c,true);
System.debug('🔹 JSON: ' + jsonString);


// In contrast, the List method size() is a NON-STATIC method with
// signature, so you invoke it by using the name of the instance variable
// public Integer size()

List<String> fruits = new List<String>{'apple','grape','cherry'};
Integer howManyFruits = fruits.size();
System.debug('🍒 size: ' + howManyFruits);
//Next line throws an error. Error: Method does not exist or incorrect signature: void size(List<String>) from the type List
// System.debug('alt size: ' + List.size(fruits));

List<String> pets = new List<String>{'dog','cat','bird','fish'};
Integer howManyPets = pets.size();
System.debug('🐶 size: ' + howManyPets);