ここ何日もjavascriptのArrayの更新について考えていましたが・・・結末は簡単だった

stackoverflow.com

removeして、追加しなおしとか考えていましたが。

まじかい。whereでは、参照が返ってくるのか。知らなかったっすｗｗｗ

node
> var __ = require('lodash');
undefined
> var a = [{name: 'dokechin'}];
undefined
> var match = __.where(a, { name : "dokechin" });
undefined
> match
[ { name: 'dokechin' } ]
> match[0].name = "hogetin";
'hogetin'
> a
[ { name: 'hogetin' } ]

配列の中の配列の更新だってお手の物

node
> var __ = require('lodash');
undefined
> var a = [{name: "dokechin",items : [{name: "pc"},{name : "watch"}]}];
undefined
> var match = __.where(a, { name : "dokechin" });
undefined
> var matcheditem = __.where(match[0].items , {name : "pc"});
undefined
> matcheditem[0].name = "tablet";
'tablet'
> a[0].items[0]
{ name: 'tablet' }

配列の最後の要素の更新

> var __ = require('lodash');
> var a = [ {name : "dakechin"},{name : "dokechin"}];
undefined
> var l = __.last(a);
undefined
> l
{ name: 'dokechin' }
> l.name = "happy";
'happy'
> a
[ { name: 'dakechin' }, { name: 'happy' } ]