A First Look at Non-Primitive Types
By the end of this lesson, you'll be able to:
- Explain the difference between primitive and non-primitive types at a conceptual level
- Name two non-primitive types you will meet soon
- Explain why this distinction will matter once you reach classes and collections
Prerequisites: "Salesforce Record IDs: the Id Type"
What makes a type 'primitive'
A primitive type holds exactly one simple value — a number, a bit of text, true/false. Every type in this module so far has been primitive. A non-primitive type holds something more structured: a collection of values, a custom-built object, a whole record's worth of fields.
Two you'll meet very soon
- Lists (Module "Collections: Lists") — an ordered group of values, like a shopping list, not just one number.
- sObjects (Module "Understanding Salesforce Data in Apex") — an in-memory representation of an actual Salesforce record, with all its fields.
You don't need to understand either yet — just recognize, going forward, that "type" in Apex means more than just "a single number or word."
Why this distinction matters later
Primitive variables are copied by value — assigning one to another makes a fully independent copy. Non-primitive types (once you meet them properly) behave differently in ways that trip up a lot of beginners if the distinction was never introduced. This lesson exists purely so that distinction doesn't come as a surprise later.
Exercise
In your own words, write one sentence explaining the difference between a primitive and a non-primitive type, without looking back at this lesson.
Show hint
Focus on 'one simple value' vs 'a structured collection of values.'
A First Look at Non-Primitive Types Quiz
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Summary
Every type you've met so far — Integer, String, Boolean, Date, Id — is a primitive: a single, simple value. Non-primitive types hold more complex, structured data, and this lesson previews what's coming without going deep yet.