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Builder Pattern

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Before: full revision: 2026-10-25 02:09:38 UTC After: full revision: 2026-10-25 03:09:42 UTC

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A report needs a title followed by rows, ~~whether its~~ output is plain text or HTML. Copying that sequence into every format makes a change to the report recipe reach each implementation.

Take a report that needs a title followed by rows, with output in plain text or HTML. Copying that sequence into every format makes a change to the report recipe reach each implementation.

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[SVG diagram] ReportRecipe calls IReportBuilder steps in order. TextBuilder and HtmlBuilder produce different representations and return the result through Finish().

[SVG diagram] ReportRecipe calls IReportBuilder steps in order. TextBuilder and HtmlBuilder produce different representations and return the result through Finish(). In the original GoF structure, GetResult lives on each ConcreteBuilder and the client collects the result; this example puts Finish() on the shared interface because both representations are strings.