isInteger64
isInteger64(): Boolean;
The isInteger64 method of the String primitive type returns true if the receiver represents a 64-bit integer value; otherwise, it returns false.
The following example shows the use of the isInteger64 method.
vars stringValue : String; begin stringValue := '+123'; write stringValue.isInteger64; // Outputs true stringValue := '+123.456'; write stringValue.isInteger64; // Outputs false end;