Check if all arrays in an object are equal to all arrays in another object

Question

So I have a data structure like this:

formSubmissions: [
    {
        ids: [1,2,3,4,5],
        genders: ["male", "female"],
        times: ["1day","3days"]
    },
    ...
]

Basically, every time a form is submitted, I want to check if the object created from the three fields in the form, is equal to anything in the formSubmissions array. If not, I want to append it to the array.

What is the fastest way to accomplish this? I have tried some other stack overflow solutions to no avail.

Thanks!

Luc125 · Accepted Answer · 2020-05-13 20:12:05Z

2

If you are on Nodejs and all you need is to compare objects by their contents, util.isDeepStrictEqual() can be useful:

if (!this.formData.some(elem => util.isDeepStrictEqual(elem, submitted))) {
    this.formData.push(submitted);
}

But please note that array values in different objects will not match if their ordering is different.

answered May 13, 2020 at 20:12

Luc125

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Luc125 · Accepted Answer · 2020-05-13 20:18:38Z

1

Another solution, using Lodash _.isEqual() as per the accepted answer in How to do a deep comparison between 2 objects with lodash?

if (!this.formData.some(elem => _.isEqual(elem, submitted))) {
    this.formData.push(submitted);
}

Note that as other Lodash utilities, it is available as a standalone NPM package, so you do not have to depend on the rest of the library.

edited May 13, 2020 at 20:18

answered May 13, 2020 at 19:48

Luc125

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Comments

Tim B. · Accepted Answer · 2020-05-13 19:08:56Z

0

Heres what I came up with while waiting for a response:

if (!(this.formData.some(el => el.voIds === submitted.voIds && 
                               el.genderList === submitted.genderList && 
                               el.times === submitted.times))) {
        this.formData.push(submitted);
      }

It seems to work. Any suggestions on how it can be improved?

answered May 13, 2020 at 19:08

Tim B.

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2 Comments

Luc125 Over a year ago

Even if it works, it looks difficult to maintain in case the structure of your objects evolve, that's why I would advise using a function for this

Tim B. Over a year ago

You're totally right. If i expect it to change, I will move to your solution. At the current time though, I don't think it will ever change.

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