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For loop

    Classic for loop

    All three “initialization/test/update” parts used.

    for (let j = 4; j < 10; j++) {
  console.log(j);
}
  

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    Basic for loop

    No initialization or update parts; only the test condition in the middle part (between the two semi-colons (;)).

    let i = 1;

for (; i <= 3;) {
  console.log(i);
  i++;
}
  

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    For loop that only exits with break or return

    This for loop will continuously “spin” unless it reaches a break or return statement, usually based on some condition to wait on that’s easier to specify in the loop body. Shown for completeness, but avoid doing this in normal code.

    for (;;) {
  console.log("loop");
  break;
}
  

    loop

    For loop with continue

    This for loop will conditionally continue to the next iteration of the loop, bypassing any remaining statements in the loop body.

    for (let n = 0; n <= 5; n++) {
  if (n % 2 == 0) continue;
  console.log(n);
}
  

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