knockout.js - How to set knockout variable from array element -

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I have to face some finger with it: 

   
 Perhaps the difference is that you  myVal The values ​​of  are set in the first object before the array is actually populated. To see if you have  console.log (self.myArray () [0])  First,  self.myVal  is set up, you should see what is happening. Since you are setting it to O. Nly once it is not subscribed to change in array I If you wanted to do this then you would calculate. 
 
  self.myVal = ko.computed (function () {return self.myArray () [0];});  
 
 will now be counted whenever anything will be added or removed from myArray

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