Actions and Events by Paul Grice

By Paul Grice

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Additional info for Actions and Events

Example text

Log if it doesn’t exist. A common solution is to use a wrapper function, but then you don’t get those precious JavaScript line numbers 10. 11. 12. 13. com/jashkenas/coffee-script/issues/558 report erratum • discuss Debugging CoffeeScript • 10 when you log something (since all the logging is being done from the same place: the wrapper function). match(/debug/) and console? g. html#debug) and the browser has a console object. This gives you an easy way to enable/disable all those extra messages when you load the page.

Rah()? 6. x refers to a variable that obeys scoping rules, while @x refers to a variable that obeys context rules. x and @x can be equivalent. If they are, then what is what? log @x what = {x: 'quantum entanglement'} 7. Will this code work? ' showAnswer() Explain why or why not. report erratum • discuss We've left this page blank to make the page numbers the same in the electronic and paper books. We tried just leaving it out, but then people wrote us to ask about the missing pages. ” CHAPTER 3 Collections and Iteration In the last chapter, we mastered functions.

In CoffeeScript, curly braces are used for one thing only: declaring JSON-style objects. ) Now if you try calling odd with anything but a positive integer, you’ll get undefined (since throw statements have no return value). ) In general, whenever conditions lead to throw or return, we can simplify branching logic to a simple series check. Of course, functions aren’t limited to just returning values and throwing exceptions; they can also do stuff by modifying variables and running other functions.

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