Filter out null or undefined values from a nested array of objects [duplicate]

Question

I have an array of nested object, I am trying to remove undefined value deep down the array

let partialMatch = [
  {
    lines: [{ id: 1}, {id: 2}]
  },
  {
    lines: [{ id: 10}, {id: 25}, undefined ]
  }
]

So far I have

   partialMatch.forEach((x) => {
      x.lines.forEach((y, index) => {
        if (!y) {
          x.lines.splice(0, index);
        }
      });
   });

k.tten · Accepted Answer · 2023-03-17 00:03:11Z

1

You can filter and then assign the result back to x.lines:

let partialMatch = [
  {
    lines: [{ id: 1}, {id: 2}]
  },
  {
    lines: [{ id: 10}, {id: 25}, undefined ]
  }
];

partialMatch.forEach((x) => {
    x.lines = x.lines.filter((v) => v !== undefined);
});

console.log(partialMatch);

answered Mar 17, 2023 at 0:03

k.tten

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