JavaScript_Frontend_FullStack/Local_VS_Global_Variable.js at main · HarshAgarwal1102/JavaScript_Frontend_FullStack · GitHub

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// Local Variable

function counter(){
    var count = 0; // Local Variable scope is Function level scope
    count++;
    return count;
}
undefined
counter();
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counter();
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counter();
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counter();
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counter();
1


// Global Variable

var count = 0;         // global scope
function counter(){
    count++;
    return count;
}
undefined
count;
0
window.count;
0
counter();
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counter();
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counter();
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counter();
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counter();
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counter();
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window.count;
6


// Disadvantage of using global (we can change it).
count = "AMIT";
'AMIT'
counter();
NaN
counter();
NaN

count++;
NaN