Var vs let in loops

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Let
let sum = 0;
for(let i = 0; i < 100e3; i++) {
  sum = sum + i;
}
ready
Var
let sum = 0;
for(var i = 0; i < 100e3; i++) {
  sum = sum + i;
}
ready
Let outside
let sum = 0;
let i;
for(i = 0; i < 100e3; i++) {
 sum = sum + i;
}
ready

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