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Exercise 3

The following code causes an infinite loop (a loop that never stops iterating). Why?

let counter = 0;

while (counter = 1) {
  console.log(counter);
  counter += 1;

  if (counter > 2) {
    break;
  }
}

Solution

The problem occurs on line 3 where we assign 1 to counter inside the conditional part of the while loop. JavaScript accepts this code since the assignment always returns a truthy value (1 in this case), the loop condition never becomes false. Furthermore, the test on line 7 never becomes true since the assignment on line 3 ensures that counter is always equal to 2 when we execute line 7.

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