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AsFloat

property AsFloat: Double read write;

Example​

procedure ScriptEvent(var Value: variant);
var
  Text: TJSONString;
  Item: TJSONValue;
begin
  Text := TJSONString.Create;
  try
    Item := Text;
    Item.AsString := '12.5';
    Value := Item.AsFloat;
  finally
    Text.Free;
  end;
end;

Usage​

AsFloat exposes the exact read/write alias of AsDouble, including strict locale-sensitive conversion and failures.

Additional Technical Info​

AsFloat is a Velox-added naming alias. Its reader is exactly the same get_AsDouble routine and its writer is exactly the same set_AsDouble routine as AsDouble; despite the name, the script type remains 64-bit Double, not Delphi Single.

Reading null returns 0.0. A non-null read calls locale-sensitive StrToFloat(AsString) and raises EConvertError for invalid text. Writing formats with locale-sensitive FloatToStr and sends the text to the concrete virtual String setter. All type-dependent container replacement, scalar validation, precision, non-finite, locale and global-settings thread-safety constraints documented for AsDouble apply without modification.

Use the alias that makes the surrounding Velox configuration clearest, but do not treat the two names as distinct representations or conversion policies. Use AsFloat0 for the separate default-on-read behavior, and inspect IsNull to preserve null-versus-zero meaning.

External references

Created 2026-07-15