how to use the variable in a for loop in Javascript?

I have a dataTable which I need to iterate through. so I have this code:

var tableSize = $(\'#j_idt11\\\\:dataTable tbody tr\').length;
for(i = 0;i< tableSize;i++){
    var test1 = document.getElementById(\"j_idt11:dataTable:0:updFoodType\").textContent;
    if(test1 == \"food\")
        alert(\"hey\");
}

but I really want to use the i in the for loop. I thought something like this:

var tableSize = $(\'#j_idt11\\\\:dataTable tbody tr\').length;
for(i = 0;i< tableSize;i++){
    var test1 = document.getElementById(\"j_idt11:dataTable:[i]:updFoodType\").textContent;
     if(test1 == \"food\")
         alert(\"hey\");
}

but that doesn\’t work. how must I use the syntax? Thanks!

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