Delete object properties similiar like deleting array elements with splice?

Mihajlo Supic Published at Dev

Mihajlo Supic

We have object type variable in Jquery:

var obj = *{"1234" : "xx", "4321" : "yy", "5555" : "hh", "2321" : "aa" };*

Lets say that I want to delete every property from property name "5555" to the end of the object(that means that I want to delete obj['5555'] and delete obj['2321'] ). I am interested in smartest way, trough loop, to do that.

In array I would use splice(2, arr.length) but I am confused.

Andy

Push the obj to be searched and the value to be found into a function that returns a new object with only those properties up to the value you specified.

function returnNewobj(obj, value) {
  var newObj = {};
  for (var prop in obj) {
    if (obj.hasOwnProperty(prop)) {
      if (prop === value) return newObj;
      newObj[prop] = obj[prop];
    }
  }
  return newObj;
}

Edit: probably not necessary, but I added the hasOwnProperty line to be on the safe side.

Edit2: It's worth pointing out that new properties are added to objects in alphanumerical order, not to the end of objects like elements are added to arrays. So don't get caught out by that.

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edited at2021-03-6

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