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String methods
Learn String methods in Apex with a construct-specific explanation, a unique example, a practical boundary, and a mastery check.
String methods 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 String methods 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
String code = ' ab-17 '.trim().toUpperCase();
Test boundary input such as empty text, unexpected encoding, or malformed structured data so parsing assumptions are explicit.