Javascript: Removing an object from array by checking it's attribute

Question

Javascript: Removing an object from array by checking it's attribute

I might have written a pretty confusing title but my question is rather simple.

I'm looking for an efficient way to remove an item from an array. But my array is full objects that has been stringified (I'm writing my app on Node.js and I'm using JSON.stringify method). So my array is like this;

"{\"userID\":\"15\",
  \"possibleFollowers\":[
      {\"followerID\":\"201\",\"friends\":716},
      {\"followerID\":\"202\",\"friends\":11887},
      {\"followerID\":\"203\",\"friends\":11887}],
  \"name\":\"John\",
  \"lon\":\"Doe\"}"

My question is on Javascript(or Node). If I wanted to remove the from possibleFollowers with "followerID: 202", how would I be able to do that efficiently?

javascript
json
performance
node.js

Answer 1

var string = "…";

var obj = JSON.parse(string);
obj.possibleFollowers = obj.possibleFollowers.filter(function(fol) {
    return fol.followerID != "202";
});
string = JSON.stringify(obj);

Answer 2

var data = "{\"userID\":\"15\",\"possibleFollowers\":[{\"followerID\":\"201\",\"friends\":716},{\"followerID\":\"202\",\"friends\":11887},{\"followerID\":\"203\",\"friends\":11887}],\"name\":\"John\",\"lon\":\"Doe\"}";

var dataObject = JSON.parse(data);
dataObject.possibleFollowers = dataObject.possibleFollowers.filter(function(follower) {
    return !(follower.followerID == "202");
});
data = JSON.stringify(dataObject);

Answer 3

In javascript, the splice method is used to delete an array element by index.

see :

http://www.roseindia.net/java/javascript-array/javascript-array-remove-index.shtml

Answer 4

try just to delete it by using "delete"

for (var i in possibleFollowers) {
    if (possibleFollowers[i]['followerId'] == '216') {
        delete possibleFollowers[i];
    }
}