On Apr 19, 2012, at 2:18 PM, Allen Wirfs-Brock wrote:
> //initialize some variable with default objects
> let {
> unidentifedAdult: mom,
> unidetifiedAdult: dad,
> unidentiedChild: brother,
> unidentifiedChild: sister
> } = peopleConstants;
>
> why is this less desirable than:
>
> //initialize some variable with default objects
> let mon = peopleConstants.unidentifiedAdult,
> dad = peopleConstants.unidentifiedAdult,
> brother = peopleConstants.unidentifiedChild,
> sister = peopleConstants.unidentifiedChild;
Well, it's rare that you *need* to re-evaluate the dot-pattern. It saves
typing, repetition (DRY!), side-effects, and running time to evaluate each
selector only once:
let mom = peopleConstants.unidentifiedAdult,
dad = mom,
brother = peopleConstants.unidentifiedChild,
sister = brother;
And you should be able to do that just fine with nested as-patterns:
let { unidentifiedAdult: mom as dad, unidentifiedChild: sister as brother }
or
let { undentifiedAdult as mom as dad, unidentifiedChild as sister as
brother }
Dave
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