Arrays 如何以特定的方式添加多维数组？

我需要一种方法来执行它，这样我就可以像

  var stuck = [["1","2","3"],["2","4","6"],["3","6","9"]]
  var duck = [["bean"],["stalk"],["jack"]]

//i need a output such that

  var output = [["bean","1","2","3"],["stalk","2","4","5"],["jack","3","6","9"]]

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因此，二维数组保持为二维数组，我可以将其与现有代码一起使用，假设两个数组的长度相等：

var output = stuck.map((item, i) => {
  return [...duck[i], ...item];
});

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这是Javascript吗？添加适当的语言标签。谢谢你做得非常好，非常感谢。你能解释一下背景中实际发生的事情吗？（以新手能够理解的方式）