Function identicalSequenceRange

lib/internal/util/inspect.js:1611–1632

(a, b)

}

function identicalSequenceRange(a, b) {
  for (let i = 0; i < a.length - 3; i++) {
    // Find the first entry of b that matches the current entry of a.
    const pos = ArrayPrototypeIndexOf(b, a[i]);
    if (pos !== -1) {
      const rest = b.length - pos;
      if (rest > 3) {
        let len = 1;
        const maxLen = MathMin(a.length - i, rest);
        // Count the number of consecutive entries.
        while (maxLen > len && a[i + len] === b[pos + len]) {
          len++;
        }
        if (len > 3) {
          return [len, i];
        }
      }
    }
  }

  return [0, 0];
}

function getDuplicateErrorFrameRanges(frames) {
  // Build a map: frame line -> sorted list of indices where it occurs