Initialize a Variable Twice in the Same Line in Javascript [duplicate]

Question

I've been looking at some Javascript/AngularJS code and something that stood out to me was this:

var searchModel = $scope.searchModel = new SearchModel('id');

I haven't seen that before and I haven't been able to find a good explanation online for it. I was wondering if someone could tell me exactly what's going on with this code?

It's just a shorthand way of assigning both searchModel and $scope.searchModel to the same value — user184994
– user184994, Commented Nov 7, 2018 at 17:21
It's creating a new SearchModel and assigning it to $scope.searchModel and a local variable named searchModel. "Chaining the assignment operator is possible in order to assign a single value to multiple variables." — JLRishe
– JLRishe, Commented Nov 7, 2018 at 17:21
Gotcha. So in this case, is it really just for convenience, i.e. so you don't have to type "$scope.searchModel" and can just type "searchModel"? — Pr0pagate
– Pr0pagate, Commented Nov 7, 2018 at 17:32

Krishna Satwaji Khandagale · Accepted Answer · 2018-11-07 17:26:15Z

1

Javascript objects are mutable , that means they are references , so when you use equal to operator , scan for left you will assign the new SearchModel('id'); to scope variable and now that points to that objects means they are nothing but the same , now this scope variable is assigned to var variable which will again contain the same object reference.

answered Nov 7, 2018 at 17:26

Krishna Satwaji Khandagale

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