Tracing through a section of code is an effective way to troubleshoot errors in not only JavaScript, but other languages as well. In Foundations of Programming Fundamentls, you'll discover functions to debug code, as well as the tracing method for debugging that can simplify the identification and fixing of bugs.
So let me show you a simple low-tech way of debugging some JavaScript code and…this concept also works in other languages.…I am going to open up an example file of JavaScript that I have.…There are a few lines here but there's not a lot of complex stuff going on,…we've talked about every single piece here.…I am defining four functions at the top of my JavaScript.…firstFunction, secondFunction, thirdFunction and fourthFunction and they're…basically just calling each other in order.…The reason that I am doing this is I want to follow a flow.…
The final function will actually change the HTML of the headline.…So the functions that are defined when the page loads, these won't be executed, but…it will know about them.…The two lines of code that I will run is this one where I am grabbing that…headline element and then I am adding an event handler to it.…I am saying when somebody clicks the headline, call firstFunction.…firstFunction should call secondFunction, secondFunction should call…thirdFunction, thirdFunction should call fourthFunction, and fourthFunction…
Author
Released
9/22/2011Finally, the course compares how code is written in several different languages, the libraries and frameworks that have grown around them, and the reasons to choose each one.
- Writing source code
- Understanding compiled and interpreted languages
- Requesting input
- Working with numbers, characters, strings, and operators
- Writing conditional code
- Making the code modular
- Writing loops
- Finding patterns in strings
- Working with arrays and collections
- Adopting a programming style
- Reading and writing to various locations
- Debugging
- Managing memory usage
- Learning about other languages
Skill Level Beginner
Duration
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Introduction
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Welcome1m 13s
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1. Programming Basics
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What is programming?5m 45s
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Writing source code5m 34s
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2. Core Programming Syntax
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Why JavaScript?4m 45s
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Requesting input4m 50s
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3. Variables and Data Types
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Working with numbers5m 4s
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Working with operators4m 47s
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Properly using white space6m 46s
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4. Writing Conditional Code
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Setting comparison operators6m 59s
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5. Modular Code
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Breaking your code apart4m 1s
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Understanding variable scope2m 23s
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6. Iteration: Writing Loops
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Introduction to iteration4m 28s
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Writing a while statement5m 24s
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Creating a for loop3m 39s
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7. More About Strings
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8. Collections
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Working with arrays5m 46s
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Array behavior5m 29s
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9. Programming Style
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Programming style5m 55s
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Writing pseudocode4m 55s
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10. Input and Output
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Event driven programming7m 47s
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Introduction to file I/O6m 51s
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11. When Things Go Wrong
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Introduction to debugging5m 57s
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Understanding error messages3m 21s
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Using debuggers8m 2s
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12. Introduction to Object Orientation
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Using classes and objects6m 28s
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13. Advanced Topics
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14. Exploring the Languages
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Introduction to languages1m 42s
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C-based languages4m 40s
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The Java world3m 13s
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Ruby3m 4s
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Python2m 56s
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Objective-C4m 3s
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Libraries and frameworks3m 25s
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Conclusion
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Where to go from here1m 2s
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Video: Tracing through a section of code