使用 Lodash 从嵌套数组中删除一个数组项

Question

如果子集数组中有值为null或0（零），则希望使用lodash从嵌套数组中删除数组项。我尝试了filter，但我正在寻找性能方面最好的方法。

const arr = [["a","b","c"],["f","r","p",0],["r",22,null,"t"],["d","e","f"]];
console.log("arr", arr);
// output should be [["a","b","c"],["d","e","f"]]

- June

Answer 1

您可以使用filter()和some()函数。

const arr = [["a","b","c"],["f","r","p",0],["r",22,null,"t"],["d","e","f"]];

let res = arr.filter(x => !x.some(a => a === null || a === 0))
console.log(res)

- Maheer Ali

Answer 2

• 使用lodash库：使用filter和includes函数：

const arr = [["a","b","c"],["f","r","p",0],["r",22,null,"t"],["d","e","f"]];
const result = _.filter(arr, x => !_.includes(x, null) && !_.includes(x, 0))
console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.14/lodash.min.js"></script>

• 使用ES6： filter和some函数：

const arr = [["a","b","c"],["f","r","p",0],["r",22,null,"t"],["d","e","f"]];
const result = arr.filter( x => !x.some(s => s === null || s === 0))
console.log(result)

• 使用ES6： reduce：

最初的回答

const arr = [["a","b","c"],["f","r","p",0],["r",22,null,"t"],["d","e","f"]];
const result = arr.reduce( (acc, c) => {
  if(c.some(x => x === null || x === 0)) {
    return acc
  }
  return [...acc, c]
},[])

console.log(result)

- Tolotra Raharison

Answer 3

你可以尝试使用 filter() 和 some()。

请注意：以下解决方案也适用于其他“假值”输入，如""和undefined。

使用 Lodash：

const arr = [["a","b","c"],["f","r","p",0],["r",22,null,"t"],["d","e","f"],["d",undefined,"f"],["d","e","f",""]];
var res = _.filter(arr, a => !a.some(i => !i));
console.log(res);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.14/lodash.core.min.js" integrity="sha256-NAQPwApfC7Ky1Y54LjXf7UrUQFbkmBEPFh/7F7Zbew4=" crossorigin="anonymous"></script>

使用原生JS：

const arr = [["a","b","c"],["f","r","p",0],["r",22,null,"t"],["d","e","f"],["d",undefined,"f"],["d","e","f",""]];
var res = arr.filter(a => !a.some(i => !i));
console.log(res);

- Mamun

Answer 4

//cost will not let modify the variable
let arr = [["a","b","c"],["f","r","p",0],["r",22,null,"t"],["d","e","f"]];


arr  = arr.filter(aItem=>{
   //compact will remove null, 0 , undefined values from array item
   return aItem.length===_.compact(aItem).length;
});

console.log("...arr",arr);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.14/lodash.core.min.js"></script>

- Rahi