fair enough ... but here there was a typo, right? set.add( value ).forEach( item => ...send to some operation.... );
Thanks On Mon, Dec 3, 2012 at 2:44 PM, Rick Waldron <waldron.r...@gmail.com> wrote: > > > > On Mon, Dec 3, 2012 at 5:21 PM, Andrea Giammarchi < > andrea.giammar...@gmail.com> wrote: > >> IMHO, a set(key, value) should return the value as it is when you address >> a value >> >> var o = m.get(k) || m.set(k, v); // o === v >> >> // equivalent of >> >> var o = m[k] || (m[k] = v); // o === v >> >> a set with a key that returns `this` is a non case so almost as useless >> as the void return is. >> > >> Usefulness comes with use cases ... except this jQuery chainability >> thingy that works fine for jQuery structure ( an ArrayLike Collection ) >> > > A collection is a collection. > > who asked for map.set(k0, v0).set(k1, v1).set(k2, v2) ? Or even >> map.set(k0,v0).get(k1) ? what are use cases for this? >> >> I am honestly curious about them because I cannot think a single one ... >> specially with the Set >> >> s.add(k0).add(k1).add(k2) ... this code looks weird inlined like this ... >> > > You're completely ignoring the iterator APIs and forEach—either of which a > program might want to call on an object post-mutation: > > Add value to the Set and... > > - get a fresh iterable for the values (or keys, or entries): > > set.add( value ).values(); > > - send each value in the set to another operation: > > set.add( value ).forEach( item => ...send to some operation.... ); > > - spread into an array of unique items: > > [ ...set.add(value) ]; // always unique! yay! > > > Add a key and value to the Map and... > > - get a fresh iterable for the keys (or values, or entries) > > map.set( key, val ).keys(); > map.set( key, val ).values(); > map.set( key, val ).entries(); > > - send each to pair to another operation (see above) > > - spread into an array of pairs (see above) > > > Being able to express the complete operation and get mutated object back > at once is a compelling use case. > > Rick > > >>
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