javascript - Omitting Condition in For Loop -

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Let anyone help me understand why the following code works: 

  Var someNumbers = [1,2,3,4,5]; Var length = some Numbers.length; (Var i = length; i--;) {console.log (i); }   
 How is this once the  i  equation considered for  0  for the loop? What about negative numbers? Will not this cause an infinite loop?   
 
 
 In javascript, anything can be a condition! In this situation, it is  i - . Once  i -  returns  0  the loop will close because  0  is Farsi.  
 The part that is missing is the third expression (see "last expression",  see  for loop) where you usually get increment / decreasing operation, but this case In both the "conditions" are combined in the expression.

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