Evaluating Expressions
There's not much point in creating Haskell files if you're going to do nothing with them. Luckily HEAT allows you to run and test Haskell files all from within the one window. Sending Evaluations The lower half of the screen comprises the output received from the interpreter and a area to type expressions for evaluation. Try this out without defining any functions by typing some simple maths and noting the response. Rather than use the program as a glorified calculator HEAT allows you to create custom functions for evaluation. If you're unsure what this means have a look at the creating Haskell files section. At the very bottom of the window is an input area for evaluations and two buttons; one to send the evaluation and one entitled reload. These perform as follows; Send Evaluation This button sends whatever text you have entered to the interpreter for evaluation. If the file is unsaved it will prompt to save. You will not be able to evaluate any new expressions you have added unless you save first unless you use the "reload" button explained below. Reload This allows you to check the status of the Haskell code without saving the work first. It is useful if you have added a new function and need to test that the interpreter now loads OK. Remember that the reload does not save the actual file you are working on so if you close without saving your work wil be lost. Status Also contained here is the status icon. This lets you know the outcome of loading the file with the interpreter; These represent status not yet known, file interpreted ok and file did not interpret ok.