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Core Syntax
Classes & Interfaces
SOQL & SOSL
DML
Triggers
Asynchronous Apex
Security & Sharing
Sets
Learn Sets in Apex with a construct-specific explanation, a unique example, a practical boundary, and a mastery check.
10 min read
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Beginner
Sets is an atomic Apex topic inside Core Syntax. The example below uses the actual construct named by the lesson rather than a generic placeholder.
Focus on what Sets changes: the input, binding, control path, object state, collection, runtime effect, or language contract. Then alter one value and verify that the behavior changes for a reason specific to this feature.
Topic-specific example
apex-01-05-sets.cls
apex
Try It Live
Set<String> tags = new Set<String>{'new','vip','new'};
Edge case / engineering note
Check the input collection shape, whether the operation mutates or returns a new value, and what happens for an empty collection.
Content source & attribution
Original Syntaxis Content · Original Syntaxis Content