isDecimal

isDecimal(): Boolean;

The isDecimal method of the String primitive type returns true if the receiver represents a valid decimal value; otherwise, it returns false.

The following example shows the use of the isDecimal method.

vars
    stringValue : String;
begin
    stringValue := '+123.456';
    write stringValue.isDecimal;     // Outputs true
    stringValue := '+123,456';
    write stringValue.isDecimal;     // Outputs false
end;