November 2019
Beginner to intermediate
674 pages
15h
English
Content preview from Mastering Delphi Programming: A Complete Reference Guide
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Extracting common expressions
This next tip will sound obvious, but it will nicely introduce us to the next topic. Plus, it is a real problem frequently found in production code.
The ExtractCommonExpression demo creates a list box with a mere 1,000 entries, all in the form Author–Title. A click on the Complicated expression button runs a short code which reverts the order of Author and Title in the list box so that it shows entries in the form Title–Author:
procedure TfrmCommonExpression.Button1Click(Sender: TObject);var i: Integer; sw: TStopwatch;begin ListBox1.Items.BeginUpdate; try sw := TStopwatch.StartNew; for i := 0 to ListBox1.Count - 1 do ListBox1.Items[i] := Copy(ListBox1.Items[i], Pos('-', ListBox1.Items[i]) + 1, Length(ListBox1.Items[i])) ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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