On Mon, Dec 3, 2012 at 5:49 PM, Andrea Giammarchi < andrea.giammar...@gmail.com> wrote:
> fair enough ... but here there was a typo, right? > > set.add( value ).forEach( item => ...send to some operation.... ); > Possibly? s/item/value/ ? Rick > > > 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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