This new notation will enable you a new way to create functions
`.map(...)` produces `(parameter) => parameter.map(...)`, it is not evaluated, it is a function definition I cannot say I like it. To me it is less readable, confusing to be exact. Anything leading with `.` (dot), seems unusual ---------- Původní e-mail ---------- Od: Scott Rudiger <scottrudi...@gmail.com> Komu: Simon Farrugia <simonfarrugi...@gmail.com> Datum: 21. 6. 2019 15:30:53 Předmět: Re: Proposal: Selector/Select Expression " I can appreciate the intent of the proposal. 👍 Minor nit with one of the examples: // user[] => email[] (With Arrays) const getEmailsList = users => users.map(user => user.contacts.email); const getEmailsList = .map(.contacts.email); ``` I would think with the proposal you'd still need to reference `users`. Otherwise what are we mapping? ``` const getEmailsList = users.map(.contacts.email); ``` On Fri, Jun 21, 2019, 4:49 AM Simon Farrugia <simonfarrugi...@gmail.com (mailto:simonfarrugi...@gmail.com)> wrote: " Selector/Select Expression Doing functional & reactive programming is currently really verbose in JavaScript. Hopefully this issue will be alleviated with the addition of the pipe operator in the near future. One things you end up doing most when doing fp is doing simple selections (mappings) on objects & arrays. This unfortunately becomes really verbose and repetitive. What I'm proposing is to be able to collapse/simplify selector arrow function expressions like this: ``` // user => email const getEmail = user => user.contacts.email; ``` to something like this: ``` // user => email const getEmail = .contacts.email; ``` More examples: ``` // user[] => email[] (With Arrays) const getEmailsList = users => users.map(user => user.contacts.email); const getEmailsList = .map(.contacts.email); ``` ``` // Usage with pipeline operator pipe(user, map(user => user.contacts.email)) user |> .contacts.email ``` I think this would work really well, particularly in conjunction with the pipeline operator, resulting in more concise and expressive code improving readability. This is just syntactic sugar, but same as in the case of the pipeline operator, selector functions are so intrinsic and commonplace to any code base, that I would think it's worth considering. I would appreciate hearing your thoughts. Thanks. _______________________________________________ es-discuss mailing list es-discuss@mozilla.org(mailto:es-discuss@mozilla.org) https://mail.mozilla.org/listinfo/es-discuss (https://mail.mozilla.org/listinfo/es-discuss) " _______________________________________________ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss "
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