Programming the BeagleBone Black: Getting Started with JavaScript and BoneScript by Simon Monk

Author:Simon Monk [Monk, Simon]
Language: eng
Format: epub
Tags: -
Publisher: McGraw-Hill Education
Published: 2014-05-05T21:00:00+00:00

One neat trick is that to avoid problems with the message containing upper and lowercase letters, each letter is converted into lowercase using toLowerCase().

Finally, to flash the message, we can just call flashText, like this:

Spend some time with this program, changing the message. Find out what happens if you put an unexpected character in the message (a number, for example). Try modifying the program so that it also flashes the digits 0 to 9.

Debugging JavaScript

The word “debugging” means fixing problems with code that is not working right. Software will occasionally behave in a manner that is unexpected and baffling. Tracking down exactly what is going wrong can be a tricky business.

Cloud9 has built-in features to help you with debugging. In particular, you can set breakpoints in the code, where the program will stop running so you can take a look at the variables and then step through the code a line at a time.

To enable debugging for a particular program, you need to click the dropdown arrow right next to the green Run button and then select Run in Debug Mode. This will change the Run button’s label to Debug.

You can now set a breakpoint in your code by clicking in the margin to the left of the line of code where you want the breakpoint. When you do this, a yellow dot will appear. This is shown in Figure 5-3, which displays the program 04_03_dice_do_while.js being debugged.

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