I've Heard Global Variables Are Bad, What Alternative Solution Should I Use?

Question

I\'ve read all over the place that global variables are bad and alternatives should be used. In Javascript specifically, what solution should I choose.

I\'m thinking

Answer 1

Other answer most explain with anonymous function as this article mention,

Anonymous functions are difficult to debug, maintain, test, or reuse.

Here are example with normal function. It's easier to read and understand.

/* global variable example */

    var a= 3, b= 6;
    
    function fwithglobal(){
    console.log(a, b); // 3 6 expected
    }
    
    fwithglobal(); // first call
    
    function swithglobal(){
    var a=9;
    console.log(a, b); // not 3 6 but 9 6
    }
    
    swithglobal(); // second call
    

/* global variable alternative(function parameter) */

    function altern(){
    var a= 3, b= 6; // var keyword needed
      f_func(a,b);
      s_func(a,b);
    }
    
    function f_func(n, m){
    console.log(n, m); // 3 6 expected
    }
    
    function s_func(n, m){
    var a=9;
    console.log(n, m); // 3 6 expected
    }
    
    altern(); // only once