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//1
var i = 0; 
var len = arr.length;
var arr = [1,2,3,4,5]; 

for(; i < len; i++) {
  console.log(arr[i]);
}

//2
for(var arr = [1,2,3,4,5], i = 0, len = arr.length; i < len; i++) {
  console.log(arr[i]);
}