Class ConsArray

deps/v8/tools/consarray.mjs:39–79

 * @constructor
 */
export class ConsArray {
  constructor() {
    this.tail_ = new ConsArrayCell(null, null);
    this.currCell_ = this.tail_;
    this.currCellPos_ = 0;
  }
  /**
   * Concatenates another array for iterating. Empty arrays are ignored.
   * This operation can be safely performed during ongoing ConsArray
   * iteration.
   *
   * @param {Array} arr Array to concatenate.
   */
  concat(arr) {
    if (arr.length > 0) {
      this.tail_.data = arr;
      this.tail_ = this.tail_.next = new ConsArrayCell(null, null);
    }
  }

  /**
   * Whether the end of iteration is reached.
   */
  atEnd() {
    return this.currCell_ === null ||
        this.currCell_.data === null ||
        this.currCellPos_ >= this.currCell_.data.length;
  }

  /**
   * Returns the current item, moves to the next one.
   */
  next() {
    const result = this.currCell_.data[this.currCellPos_++];
    if (this.currCellPos_ >= this.currCell_.data.length) {
      this.currCell_ = this.currCell_.next;
      this.currCellPos_ = 0;
    }
    return result;
  }
}


/**