Mastering JavaScript Functional Programming - Second Edition

Finding unique words

Finally, let's go for another example, which, I agree, could have also been used for pipelining. Suppose you have some text and want to extract all the unique words from it: how would you go about doing this? 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:

1. Ignore all non-alphabetic characters
2. Put everything in uppercase

3. Split the text into words
4. 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 ...