javascript - How can I push a null value into the start of an array? -

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I have this code that brings data and puts it in an array: 

  This $ httpGetTest (this.test.testId) .success (function (Data: ITestQuestion []) {self.test.qs = data;});   
 This works and generates an array starting with self.test.qs [0].  
 Although sometimes my code refers to this array (which contains a list of questions 1 ... x)  
 Let me always reduce the question number to 1 and So my code does not look clear. Is there any way that I can enter the array in front of all other people so that:  
  self.test.qs [0] is empty self.test.qs [1] Reference Question First actual data for number 1   
 Ideally I would like to do this after entering  self.test.qs =  and after the code .   
 
 
 From the beginning of the array  
  self.test.qs.unshift (Zero);

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