In an example method, a user interface is presented by a device on a touch sensitive surface of the device. The user interface includes a first portion for displaying a sequence of code and a second portion for displaying suggested bracketed functions. The device receives a first touch gesture dragging a suggested bracketed function from the second portion to the first portion of the user interface. Responsive to receiving the first touch gesture, the suggested bracketed function is inserted into the sequence of code. The bracketed function encloses at least a portion of the sequence of code. The device receives a second touch gesture dragging an end bracket associated with the inserted bracketed function. Responsive to receiving the second touch gesture, the sequence of code is modified such that the bracketed function encloses an additional portion of the sequence of code.