javascript 从 assoc 数组中删除(空)数组

Question

我有一个 assoc js 数组，我想从中删除一个元素。 我的解决方案有效，但不太好，有更好的解决方案吗？

// i got this assoc array
var cm = [];
    cm["a"] = ["a"];
    cm["b"] = ["c"];
    cm["s"] = ["a", "b", "c"];
    cm["x"] = [];
console.log(cm);

var searchKey = "s";
var p = ["a","c","d", "b"]; // to remove from searchKey array

// remove elements (works fine)
cm[searchKey] = cm[searchKey].filter(value => (p.includes(value) === false));
console.log(cm); // now cm[searchKey] is an empty array

// if the array at index 'searchKey' is empty remove it from assoc array
var newarray = [];
if (cm[searchKey].length===0)
{
    for(key in cm)
  {
    if (key!=searchKey) newarray[key] = cm[key];
  }
}
cm = newarray;
console.log(cm);

我尝试使用过滤器和拼接，但两者都仅适用于数组而不是关联数组。

Answer 1

你有一个对象，所以你可以这样做:

if (cm[searchKey].length===0)
{
    delete cm[searchKey]
}