Loops and Ranges

Continue in Loops

Skip the rest of one iteration.

continue-loop `continue` skips to the next iteration. It is useful when one value should not participate in the rest of the loop body.

Continue in Loops

skip
continue_loop.js
Replay: real traced execution (multi-file project)
const skip = 2;
let total = 0;
for (let i = 1; i <= 5; i += 1) {
  if (i === skip) {
    continue;
  }
  total += i;
}

console.log("skip=" + skip);
console.log("total=" + total);

const skip = 3;
let total = 0;
for (let i = 1; i <= 5; i += 1) {
  if (i === skip) {
    continue;
  }
  total += i;
}

console.log("skip=" + skip);
console.log("total=" + total);

const skip = 5;
let total = 0;
for (let i = 1; i <= 5; i += 1) {
  if (i === skip) {
    continue;
  }
  total += i;
}

console.log("skip=" + skip);
console.log("total=" + total);

  1. skip ← 2, total ← 0

    1const skip→ 2 = 2; //@skip=3, 52let total→ 0 = 0;3for (let i = 1; i <= 5; i += 1) {

  2. total ← 1

    pass 1 of 5
    1const skip = 2; //@skip=3, 52let total = 0;3for (let i1 = 1; i <= 5; i += 1) {4  if (i === skip) {5    continue;6  }7  total += i1;8}
    values this step1total
    All 5 passes — pass 1 is the card above
    passiskiptotal
    11—1
    222—
    33—4
    44—8
    55—13

  3. if (i === skip)

    2let total = 0;3for (let i = 1; i <= 5; i += 1) {4  if (i2 === skip2) {5    continue;6  }

  4. console.log("skip=" + skip);

    7  total += i;8}910console.log("skip=" + skip2);11console.log("total=" + total13);
    outputskip=2
total=13

  1. skip ← 3, total ← 0

    1const skip→ 3 = 3;2let total→ 0 = 0;3for (let i = 1; i <= 5; i += 1) {

  2. total ← 1

    pass 1 of 5
    1const skip = 3;2let total = 0;3for (let i1 = 1; i <= 5; i += 1) {4  if (i === skip) {5    continue;6  }7  total += i1;8}
    values this step1total
    All 5 passes — pass 1 is the card above
    passiskiptotal
    11—1
    22—3
    333—
    44—7
    55—12

  3. if (i === skip)

    2let total = 0;3for (let i = 1; i <= 5; i += 1) {4  if (i3 === skip3) {5    continue;6  }

  4. console.log("skip=" + skip);

    7  total += i;8}910console.log("skip=" + skip3);11console.log("total=" + total12);
    outputskip=3
total=12

  1. skip ← 5, total ← 0

    1const skip→ 5 = 5;2let total→ 0 = 0;3for (let i = 1; i <= 5; i += 1) {

  2. total ← 1

    pass 1 of 5
    1const skip = 5;2let total = 0;3for (let i1 = 1; i <= 5; i += 1) {4  if (i === skip) {5    continue;6  }7  total += i1;8}
    values this step1total
    All 5 passes — pass 1 is the card above
    passiskiptotal
    11—1
    22—3
    33—6
    44—10
    555—

  3. if (i === skip)

    2let total = 0;3for (let i = 1; i <= 5; i += 1) {4  if (i5 === skip5) {5    continue;6  }

  4. console.log("skip=" + skip);

    7  total += i;8}910console.log("skip=" + skip5);11console.log("total=" + total10);
    outputskip=5
total=10