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setTimeout
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    setTimeout

    : 5

    setTimeout 100ms

    alert 

    let i = 0;

setTimeout(() => alert(i), 100); // ?

//  100ms 
for(let j = 0; j < 100000000; j++) {
  i++;
}

    setTimeout

    i 100000000 

    let i = 0;

setTimeout(() => alert(i), 100); // 100000000

// assume that the time to execute this function is >100ms
for(let j = 0; j < 100000000; j++) {
  i++;
}
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