Find the difference between two JavaScript objects

Asked Dec 24 '15 at 02:05

Active Dec 24 '15 at 02:10

Viewed 97 times

I have two JavaScript literal objects below:

var obj1 = {
3a5f5c70-58ef-4e4b-8fe0-a271ea2b4f11: true,
9e185ad9-0816-4c5b-ab97-a6c0103d6c22: true,
-K5F-v9lDvZPgDuVhMi3: true,
-K5F-wzH1J01CFXZ9r2c: true,
-K5F-x6H4NXdlwXlolQE: true}

var obj2 = {
-K5F-v9lDvZPgDuVhMi3: true,
-K5F-wzH1J01CFXZ9r2c: true
}

I want to find the difference between them so that when I call:

var result = findDifference(obj1, obj2);

So that the result variable would be

result = {
3a5f5c70-58ef-4e4b-8fe0-a271ea2b4f11: true,
9e185ad9-0816-4c5b-ab97-a6c0103d6c22: true,
-K5F-x6H4NXdlwXlolQE: true
}

I could loop both objects and compare their keys for non-equality or probably convert to then array type first. But I am curious if there is an existing library that is more efficient when the objects grow larger. I have looked at underscore but cant seem to find one that meet my need.

jsfiddle: https://jsfiddle.net/1y3a72rn/

asked Dec 24 '15 at 02:05

rattanak

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What if the same keys in both objects have different values? What about nested objects? What about arrays? Does order matter in arrays? – Matt Ball Dec 24 '15 at 02:08
http://stackoverflow.com/questions/201183/how-to-determine-equality-for-two-javascript-objects – sjt003 Dec 24 '15 at 02:08
@sjt003 diff is strictly harder than equals. – Matt Ball Dec 24 '15 at 02:09
Ignore different values for now. If the key is the same remove it. – rattanak Dec 24 '15 at 02:13
See also http://stackoverflow.com/q/22108837/139010 and http://stackoverflow.com/q/8431651/139010 – Matt Ball Dec 24 '15 at 02:14

Find the difference between two JavaScript objects

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