setTimeout values inside for loop in javascript

Question

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why it is printing 11 eleven times?this code is printing 0,1,2,3,4 ....10, while i is declared using let. But why it is printing 11 while i is decalred using var. why it is printing 11 inside setTimeout()

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for(var i = 0; i<= 10; i++){
    console.log(i);
    setTimeout(function(){
        console.log(i);
        },0);
}