Pick returns different object structure from original object with numeric keys #5948

chreds · 2024-12-09T16:43:08Z

pick() is returning a different object structure from original object when using numeric keys

Using lodash-es: 4.17.21

Code to reproduce:

import { set, pick } from 'lodash-es'

const index = ["a", "0", "c"]

const orig1 = {
    "a" : {
        "0": {
            "c": "ABC",
            "d": "DEF"
        }
    }
}

const orig2 = {
    "a" : [{
            "c": "ABC"
        },{
            "d": "DEF"
        }]
}

console.log(JSON.stringify(orig1))
console.log(JSON.stringify(orig2))
const calc1 = {...orig1}
const calc2 = {...orig2}
set(calc1, index, "XYZ")
set(calc2, index, "XYZ")
console.log(JSON.stringify(calc1))
console.log(JSON.stringify(calc2))
const pick1 = pick(calc1, [index])
const pick2 = pick(calc2, [index])

console.log(JSON.stringify(pick1))
console.log(JSON.stringify(pick2))

Output:

{"a":{"0":{"c":"ABC","d":"DEF"}}}
{"a":[{"c":"ABC"},{"d":"DEF"}]}
{"a":{"0":{"c":"XYZ","d":"DEF"}}}
{"a":[{"c":"XYZ"},{"d":"DEF"}]}
{"a":[{"c":"XYZ"}]}
{"a":[{"c":"XYZ"}]}

I would have expected pick1 output to be in object format instead of array for the key "0" since that's the structure of the input object.

I know numeric keys are dumb. It just looks like a lot of effort went into set() and get() to support both so thought pick would respect original object format too.

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Pick returns different object structure from original object with numeric keys #5948

Pick returns different object structure from original object with numeric keys #5948

Pick returns different object structure from original object with numeric keys #5948

Pick returns different object structure from original object with numeric keys #5948

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