Rated J for JavaScript

We're going to develop a suite of functions that will help us publish and censor internet comments. (Like you do.)

Define the following functions:

• regularPrint(content) – accepts a string content and prints it to the console

• loudPrint(content) – accepts a string content and prints an upcased version of it surrounded by stars (e.g. ***THIS VIDEO SUCKS***)

• omissionCensor(content, badWords) – accepts a string content and an array of strings badWords, and returns a version of content with all instances of the strings in badWords removed

• substitutionCensor(content, badWords) – accepts a string content and an array of strings badWords, and returns a version of content with all instances of the strings in badWords replaced with a random element from an array of "substitute" strings (internally defined in the function)

• publishComment(comment, badWords, censorFunction, printFunction) – accepts a string comment, an array of strings badWords, a function to censor the comment censorFunction, and a function to print the comment printFunction

Note: Don't worry about handling punctuation gracefully. For now, just use simple strings with no punctuation.

Once you write these functions, call publishComment with a string of your choosing 4 times, once with each combination of censorFunction and printFunction. For example:

publishComment("what the hell is going on", ["damn", "hell"], omissionCensor, loudPrint);

Once you are done with all of the above, design and implement another censor function and another print function. They can operate however you like (go nuts!). Demonstrate the use of these new functions by calling publishComment with them.

Extra Challenge

Define a function generateCommentPublisher(badWords, censorFunction, printFunction) This function should return a new function which only takes one string argument, and "publishes" it using the badWords, censorFunction, and printFunction that were specified when it was generated.

Example usage:

var loudOmissionAntiSwearingPublisher = generateCommentPublisher(["shit", "crap"], omissionCensor, loudPrint);
var regularSubstitutionRubyHaterPublisher = generateCommentPublisher(["ruby", "rails", "Matz"], substitutionCensor, regularPrint);

loudOmissionAntiSwearingPublisher("javascript is the shit");
// Prints: "***JAVASCRIPT IS THE***"

regularSubstitutionRubyHaterPublisher("I think that Hari and Matz and ruby on rails are the best");
// Prints something like: "I think that Hari and pandas and noodles on bandsaw are the best"

Further Reading

If you want to read more on these concepts, and feel somewhat comfortable with the exercise, you may want to have a look at the Functional Programming chapter from the book Eloquent JavaScript. The rest of the book is worth a look as well.