Deleting javascript object properties not matching a string

Question

I have a javascript object that looks similar to this:

object {
  attribute[1424]1405: 149,
  attribute[1425]1406: 149,
  attribute[1426]1407: 149,
  attribute[1426]1408: 149,
  attribute[1649]2116: 149,
  attribute[1649]2117: 179,
  attribute[1649]2408: 119
}

I'm trying to remove all properties that don't begin with attribute[1649] (stored in a variable called conditionID). Is there some sort of filter, similar to !:contains() that I can run against the object with a delete command?

Community · Accepted Answer · 2017-05-23 10:26:39Z

2

No, there is not. Just use a regular for in loop:

for (var p in obj) 
    if (!/^attribute\[1649\]/.test(p))
        delete obj[p];

(see How to check if a string "StartsWith" another string? for alternatives to the regex)

edited May 23, 2017 at 10:26

CommunityBot

11 silver badge

answered Aug 26, 2015 at 19:08

Bergi

671k162 gold badges1k silver badges1.5k bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Josh Burdick Over a year ago

Thanks @Bergi , that works very well when I explicitly state the string to test for. The string I'm trying to test for (attribute[1649] in this example) however, is stored in a variable, which I think is what led me down the path of using delete. I'm trying code like this, but am not having any result: r = "!/" + conditionID + "/.test(p)"; reg = new RegExp(r, "g"); delete amounts[reg];

Bergi Over a year ago

The ! operator is not part of the regex, neither are the / literal delimiters. Anyway you should not use a regex here (it would require escaping etc), just use one of the solutions in the linked article for dynamic patterns.

Collectives™ on Stack Overflow

Deleting javascript object properties not matching a string

1 Answer 1

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related