@John: Good point. IIRC, Mocha was (is?) one of such test frameworks that inspect the function's `length` property in order to determine whether the author intends the test to be run asynchronously (i.e. the first argument receives a function that must be called when the test is done). Whether that is a good practice is questionable, however.
/fm On Thu, Apr 21, 2016 at 7:44 PM, John Lenz <[email protected]> wrote: > _=>{} is a function that takes one param and is not equivalent to ()=>{}. > Some test frameworks inspect the function and care about the difference. > On Apr 21, 2016 3:34 PM, "Fabrício Matté" <[email protected]> wrote: > > The `==>` token would look like a new operator, which developers would > have to look up in order to know exactly what it does. It is more confusing > than helpful, IMHO. > Also `==>x` has the same length as `_=>x`, the latter not introducing any > new syntax (although it does employ an ugly unused identifier). > > By the way, this may be of interest to you: Headless Arrow Functions > proposal <http://bterlson.github.io/headless-arrows/>. > > /fm > > On Thu, Apr 21, 2016 at 3:48 PM, Peter van der Zee <[email protected]> wrote: > >> <searched for it><excuses if> >> >> There are two ways of writing argument-less arrows; >> >> () => x; >> _ => x; >> >> (Where `_` can be any identifier, of course.) I understand why we >> can't drop the head entirely so if we're forced to type anything at >> all, anyways, why not at least make it simpler by pressing two >> different keys instead of three/four: >> >> ==> x; >> >> I don't believe this leads to syntactical problems anywhere, not even >> with arrow functions themselves and it's future proof for at least the >> cases I'm aware of. >> >> It's a minor addition but I think it's much nicer than either of the >> two alternatives we currently have, which lead to a lot of >> inconsistencies (it's spaces and tabs all over again). >> >> Semantics are the same otherwise as `() => x` would be. >> >> - peter >> _______________________________________________ >> es-discuss mailing list >> [email protected] >> https://mail.mozilla.org/listinfo/es-discuss >> > > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > >
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