Stop nesting ternaries in JavaScript

philnash ( @philnash@programming.dev ) · 11 months ago

Stop nesting ternaries in JavaScript

spartanatreyu ( @spartanatreyu@programming.dev ) · 11 months ago

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 ( @CameronDev@programming.dev ) · 11 months ago

Your probably right, that looks quite desirable.

snowe ( @snowe@programming.dev ) · 11 months 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.

spartanatreyu ( @spartanatreyu@programming.dev ) · 11 months ago

Match already returns the value which can be thrown into a variable.

JakenVeina ( @JakenVeina@lemm.ee ) · edit-2 11 months ago

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 ( @spartanatreyu@programming.dev ) · edit-2 11 months 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";
}

JakenVeina ( @JakenVeina@lemm.ee ) · 11 months ago

Aha, yeah, I see it now. Looking forward to it.