javascript - How does this function work in particular? -

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Can anyone tell me how this function works? I know the turner operator, so I understand this part, it checks whether the flag is true , and if not, use 2. value. But I do not understand why flag is a boolean in the first place and why it is true to false and vice versa when Chetan () is being called ...

  flag = $ texte.data ('animate toggle'); $ Texte.data ('encrypt toggle', flag); $ Texte.animate ({'left': flag? '-51%': '0'})    
 
 
 JavaScript has values ​​that are similar to the  true  and  false  to be evaluated as booleans, that means  True  and  false  are not the only values ​​that can represent true or false data. For example, if  $ texte .data ('alert toggle') is equal to   0  as  falsy  as  0 < / Code> will  falsy  value.  
 Example 1:  1000   
  1000  is an  true  value, so this output is "True "Will be:  
  var flag = 1000; Console.log (flag? "True": "falls"); & Gt; "True"   
 example 2:  ""   
  ""  (empty string) is a  Pharsy  value, so it will output "false":  
  var flag = ""; Console.log (flag? "True": "falls"); & Gt; "False"   
 
 converts a value for the boolean and  rejects   $ texte.data ('animToggle',! Flag);  set  animategroup  data of property  $ texte  which was previously.  
 ! True // Incorrect! 1000 // false! False / true! "" //right