On: JavaScript Pattern Matching Proposal

[mpfundstein]

If you mean by method-based pattern matching that you evaluate a function for each 'case'. My lib can do that do:

    const match = require('pmatch-js')
    const _ = require('lodash')

    const fizzbuzz = x => match(x)
      .when(a => a % 3 == 0 && a % 5 == 0, 'fizzbuzz')
      .when(a => a % 5 == 0, 'buzz')
      .when(a => a % 3 == 0, 'fizz')
      .otherwise(a => a)

    console.log(
      _.range(1, 101).map(fizzbuzz).join(' ')
    )

But maybe you mean something totally different :-)

EDIT: Ah I think I know what you mean. Your lib takes an array of tuples to define the patterns. Sorry for the confusion.

[dkarbayev → mpfundstein]

Wow, importing the whole lodash to use just one function? There’s es6 way of getting an array with a range of numbers:

    [...Array(100).keys()].map(v=>v+1)

A little bit longer but no dependencies.

[fangaorne → dkarbayev]

Although this method is pretty, I see 4 loops in this small line. a better way would be to only import the range method from lodash like so :

    import _range from "lodash/range";

[mpfundstein → dkarbayev]

Pretty cool trick mate. Didn’t know