javascript - Difference between free variable and local free variable -


this question has answer here:

i reading tutorial javascript closure.there concept called free variables.free variables variables neither locally declared nor passed parameter.

the tutorial's first example:

function numbergenerator() {    // local “free” variable ends within closure    var num = 1;    function checknumber() {       console.log(num);    }    num++;    return checknumber;  }    var number = numbergenerator();  number();

in example, comment said num local free variable.but above concept free variable said free variable not locally declared.i confusing that.

not sure question num availible within closure considered "private" variable of numbergenerator.


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