Mastering JavaScript Functional Programming

Finding unique words

Finally, let's go for another example, which, I agree, could also have been used for pipelining. Suppose you have a text, and you want to extract all unique words from it: how would you go about it? If you think about it in steps (instead of trying to create a full solution in a single bit step) you would probably come up with a solution similar to this:

• Ignore all non-alphabetic characters
• Put everything in uppercase
• Split the text into words
• Create a set of words

Why a set? Because it automatically discards repeated values; check out https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Set for more on this. By the way, we will be using the Array.from() method to produce an array out of our ...