Show HN: Ferrum.js – Rust features in JS: traits and advanced iteration

Re:Show HN: Ferrum.js – Rust features in JS: traits and adva... by Leszek on Wednesday July 03, 2019 @07:52AM (#20343429)

You want a conditional expression in JavaScript ? you could use the ternary operator : you don't have to use it if you don't want to though;

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Re:Show HN: Ferrum.js – Rust features in JS: traits and adva... by nicoburns on Wednesday July 03, 2019 @09:08AM (#20343956)

Ternary operator don't nest very nicely though (they do nest , but it's not very readable). IMO a bigger difference is Rust's match and blocks also being expressions. These have no alternatives in JavaScript.

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Re:Show HN: Ferrum.js – Rust features in JS: traits and adva... by bfrydl on Wednesday July 03, 2019 @09:25AM (#20344061)

Nesting multiple branches of ternary operators doesn't work well but if it's a sort of “if elseif elseif else” situation I think this looks pretty nice:

    x > 0 ? 'positive' :
    x < 0 ? 'negative' :
    'zero'

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Re:Show HN: Ferrum.js – Rust features in JS: traits and adva... by nicoburns on Wednesday July 03, 2019 @09:32AM (#20344110)

But not nearly as nice as:

    match x {
        0 => 'zero',
        x if x > 0 => 'positive',
        x if x < 0 => 'negative',
    }

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Re:Show HN: Ferrum.js – Rust features in JS: traits and adva... by svrtknst on Wednesday July 03, 2019 @10:42AM (#20344674)

I actually made a library for that!

It's published on npm and everything. It's small, a bit unpolished, maybe needs more docs, but it works pretty damn well if you ask me!

https://gitlab.com/svartkonst/match

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Re:Show HN: Ferrum.js – Rust features in JS: traits and adva... by matthewhartmans on Wednesday July 03, 2019 @08:04AM (#20343511)

I see what you did there ( ͡° ͜ʖ ͡°)

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