isInteger

isInteger(): Boolean;

The isInteger method of the String primitive type returns true if the receiver represents an integer value; otherwise, it returns false.

The following example shows the use of the isInteger method.

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