Lodash - replace object in array with the same index

Question

I want to replace the object with the same ID in an array. I have used .unionBy using Lodash. The problem is the the new object appears at the the first instead of the same index.

Here is my code. Hope you can help me. Thanks!

state.allStudents is the array. And the students is the new object to replace that existing object in the array with same _id

state.allStudents = _.unionBy([students], state.allStudents, '_id');

Why downvote? The question was clearly asked and he offered enough information to solve and he showed us what he trried. — mankowitz
– mankowitz, Commented Jun 22, 2020 at 18:40

mankowitz · Accepted Answer · 2020-06-22 13:40:36Z

1

I would use .findIndex and .splice

    let index = state.allStudents.findIndex(i => i._id === students._id);
    if (index != -1) {
        state.allStudents.splice(index, 1, students);
    }

answered Jun 22, 2020 at 13:40

mankowitz

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1 Comment

mankowitz Over a year ago

I'm guessing that you are using vuex. If so, this has the added benefit of maintaining reactivity.

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