A separate method such as the previously mentioned setdefault() provided by Python [1] might answer both Mark’s concerns and yours.
[1] http://docs.python.org/dev/library/stdtypes.html#mapping-types-dict On Jan 16, 2012, at 22:21 , David Bruant wrote: > [Specifying the Davids] > > Le 16/01/2012 21:56, Mark S. Miller a écrit : >> I like the idea of the two argument get as proposed by David [BRUANT]. >> (In fact, I like it so much that I thought I'd already specified it >> that way ;).) David [HERMAN], I'm glad to see you got it right in your >> suggestion at >> <http://wiki.ecmascript.org/doku.php?id=harmony:weak_maps#alternate_spec_based_on_ff6.0a1>. > Actually, that's not what I meant. > What I meant was to replace the get that is currently where you link to with > ------ > get(key, defaultValue = undefined) { > if (key !== Object(key)) { > throw new TypeError(...); // key must be an object > } > const i = private(this).keys.indexOf(key); > > if(i < 0 && defaultValue !== undefined){ > this.set(key, defaultValue); > } > > return private(this).values[i]; > } > ------ > > In this version, if the key is not found, the property is set to the > return value. > The return statement returns the value that is there if the key existed > in the map or the default value (which has just been assigned). > > David > -- Dr. Axel Rauschmayer [email protected] home: rauschma.de twitter: twitter.com/rauschma blog: 2ality.com _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
