How to remove an object from an array based on given property

Question

I have an array of objects:

[
  { content: "lelzz", post_id: "241" },
  { content: "zzyzz", post_id: "242" },
  { content: "abcde", post_id: "242" },
  { content: "12345", post_id: "242" },
  { content: "nomno", post_id: "243" }
]

How can I remove all objects with a post_id of '242'?

Answer 1

Two steps:

1. loop through array backwards
2. Array.prototype.splice for indices with the matching property

function removeObjectsWithPostId (arr, id) {
    for (var i = arr.length - 1; i > -1; i--) {
        if (arr[i].post_id === id) arr.splice(i, 1)
    }
    return arr
}

If you know that there might be more than one object with this property, you should instead prefer Array.prototype.filter:

function removeObjectsWithPostId (arr, id) {
    return arr.filter(function (obj) { return obj.post_id !== id })
}