How to delete multiple objects whose id='null' -JS

Question

I have list of objects whom I want to loop through to see for the value of a key, in this I want to remove objects whode id= "null". Below is snippet:

obj: {
 after:{
 id: null,
 name:'test',
 address: '63784hgj'
 },
 before:{
 id: 678346,
 name:'test',
 address: '63784hgj'
 },
 single:{
 id: null,
 name:'test',
 address: '63784hgj'
 },
 range:{
 id: 65847,
 name:'test',
 address: '63784hgj'
 }
 }

I tried some sloppy way of doing this, considering I know the object that has id with null value:

obj.abc.id.destroy;
obj.abc3.id.destroy;

below is the way the object is seen: enter image description here

is there any way I could remove objects that dont have null values for their id's?

Thx~

• user1106925: You're asking how to delete a property of an object?
• user1234: no delete the whole object if the value of a prop is null
• vtange: Pretty sure you can do delete obj.single in this case. if you wanted to loop, maybe loop var prop in obj and if (obj[prop].id === null), you delete obj[prop]
• user1106925: But the object you want to delete is on a property of another object, right?
• vtange: Do you want to delete obj or delete single?

Answer 1

If you want to just delete single: delete obj.single;

If you want to delete multiple objects within obj:

for (var prop in obj){
 if (obj[prop].id === null){
 delete obj[prop];
 }
}

Answer 2

you can use the delete operator.

e.g.

for (var prop in obj) { 
 var item = obj[prop]; 
 if (!item.id) {
 delete item; 
 }
}

• user1234: how about for deleting multiple object in one func? I'd need to remove the single and after object coz both of them have prop with null values
• Dan: just loop through each item in the object

Answer 3

I think these are simpler answers than above (with respect to line of code):

var obj= {
 after:{ id: null, name:'test', address: '63784hgj' },
 before:{ id: 678346, name:'test', address: '63784hgj' },
 single:{ id: null, name:'test', address: '63784hgj' },
 range:{ id: 65847, name:'test', address: '63784hgj' },
 };
// Solution #1: set items to new object.
var newObj = {};
Object.keys(obj)
 .forEach(k => obj[k].id && (newObj[k] = obj[k]));
// Solution #2: delete unwanted from object itself.
Object.keys(obj)
 .forEach(k => !obj[k].id && delete obj[k]);
console.log(newObj);
console.log(obj);