optimization - Cheapest way of making a number negative in Javascript -

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I'm building a physics engine in JavaScript. I am reading some articles about operational costs in connection with the use of CPU, but I am not getting the answer to this problem. I want to make a "negative" I have come up with two different solutions: 

  a * = -1;   
 or  
    / div> 
 
 
 This seems over-optimization.  
 I will go for another because it is small  
  a * = - 1; // 5 a = -a; // 4

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