javascript - Duplicate array -

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I need to duplicate and manipulate an array variable, but for some reason when I created a new value array I'll put values ​​in the original array pushing the value. 

  function test (point) {var newArray = currentChain; NewArray.push (dot); }   
 In this situation, the point is being added to the  current chain  variable. Note that somewhere I am not setting  currentChain  as equal to  newArray  and there is no other variable in the script named  newArray . Why is this being done?   
 
 
 To fix this, you need to clone your array. For example using the method:  
  var newArray = currentChain.slice ();   
 This happens because your  newer   currentChain  is an indicator for the array.

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