this post was submitted on 11 Dec 2023
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JavaScript

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Stop nesting ternaries in JavaScript (www.sonarsource.com)
submitted 2 years ago by philnash@programming.dev to c/javascript@programming.dev
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[–] CameronDev@programming.dev 3 points 2 years ago (1 children)

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/switch - hasnt it had this forever? Or are you refering to something else?

[–] spartanatreyu@programming.dev 9 points 2 years ago (3 children)

Pretty sure they meant match as in pattern matching, not switch as in switch/case/break.

You can see the proposal here: https://github.com/tc39/proposal-pattern-matching

[–] CameronDev@programming.dev 2 points 2 years ago

Your probably right, that looks quite desirable.

[–] snowe@programming.dev 1 points 2 years ago

they also said switch expressions, which indicates they want the switch statement to be settable directly to a variable with whatever the return type of the switch is.

[–] JakenVeina@lemm.ee 0 points 2 years ago* (last edited 2 years ago) (1 children)

Nah, I meant switch, as that's what it's called in C#-land. See above.

That proposal for matching looks interesting, but not quite the same, no.

[–] spartanatreyu@programming.dev 2 points 2 years ago* (last edited 2 years ago)

Are you sure?

Your C# example:

var output = input switch
{
    null    => "Null",
    0       => "Zero",
    > 0     => "Positive",
    _       => "Negative"
};

JS proposal for match:

const output = match input {
    when null:    "Null";
    when 0:       "Zero";
    if input > 0: "Positive";
    default:      "Negative";
}