var dst = Array.from({ length: 1000 * 1000 })
var src = Array.from({ length: 1000 * 1000 }) // nodejs call stack = 100 * 1000

Array.prototype.pushAll = function (items) {
    let index = this.length
    for (const item of items) this[index++] = item
    this.length = index
    return this
}

Array.prototype.pushArrayOneSrc = function pushArray(other) {
  let c = 0; // count pushed elements
  for (let i = 0; i < other.length; i++) {
    this.push(other[i]);
    c++;
  }
  return c;
};


Array.prototype.pushArrayOneSrcNoCount = function pushArray(other) {
  for (let i = 0; i < other.length; i++) {
    this.push(other[i]);
  }
};

Array.prototype.pushArrayOneSrcNoCountForOf = function pushArray(other) {
  for (const e of other) {
	this.push(e);
  }
};

Array.prototype.pushArray = function pushArray(...otherList) {
  let c = 0; // count pushed elements
  for (let a = 0; a < otherList.length; a++) {
    const other = otherList[a];
    for (let i = 0; i < other.length; i++) {
      this.push(other[i]);
      c++;
    }
  }
  return c;
};