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JavaScript recursive array merge like in PHP

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Feb 10.2020

Okay, I need a recursive merge function like the one in PHP

I have these arrays.

const myArray1 = [ [{ “hotel_id”: “84011815”, “city”: “Dubai” }, { “hotel_id”: “84011815”, “offer_id”: “43230076|1|2293” }, { “hotel_id”: “84011815”, “offer_id”: “16013804|4|1643” } ], [{ “hotel_id”: “84011815”, “city”: “Dubai” }, { “hotel_id”: “84011815”, “offer_id”: “28295947|1|1176” }, { “hotel_id”: “84011815”, “offer_id”: “4221802|3|2316” } ] ]

const myArray2 = [ [{ “hotel_id”: “84011815”, “city”: “Dubai” }, { “hotel_id”: “84011815”, “offer_id”: “43230076|1|2293” }, { “hotel_id”: “84011815”, “offer_id”: “16013804|4|1644” } ], [{ “hotel_id”: “84011815”, “city”: “Dubai” }, { “hotel_id”: “84011815”, “offer_id”: “28295947|1|1177” }, { “hotel_id”: “84011815”, “offer_id”: “4221802|3|2319” } ] ]

I want to merge them by hotel_id and make sure all offers are also merged into one resulting array… the result should be like this

[
[
{
“hotel_id”: “84011815”,
“city”: “Dubai”
},
{
“hotel_id”: “84011815”,
“offer_id”: “43230076|1|2293”
},
{
“hotel_id”: “84011815”,
“offer_id”: “16013804|4|1643”
},
{
“hotel_id”: “84011815”,
“offer_id”: “28295947|1|1176”
},
{
“hotel_id”: “84011815”,
“offer_id”: “4221802|3|2316”
}
]
]

any help?

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JavaScript

4 Comments(s) ↴

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@rootFeb 10.2020 — Try looking at .filter, .map type functions that apply a rule or function to array contents, that way you can return a new array consisting of exactly the data you want to work on.
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@kandreauthorFeb 10.2020 — @root#1614459 already tried those
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@SempervivumFeb 10.2020 — Check if the function concat() does what you require.

Edit: Didn't look close enough, check this code:
const myArray1 = [[{ "hotel_id": "84011815", "city": "Dubai" }, { "hotel_id": "84011815", "offer_id": "43230076|1|2293" }, { "hotel_id": "84011815", "offer_id": "16013804|4|1643" }], [{ "hotel_id": "84011815", "city": "Dubai" }, { "hotel_id": "84011815", "offer_id": "28295947|1|1176" }, { "hotel_id": "84011815", "offer_id": "4221802|3|2316" }]]
const myArray2 = [[{ "hotel_id": "84011815", "city": "Dubai" }, { "hotel_id": "84011815", "offer_id": "43230076|1|2293" }, { "hotel_id": "84011815", "offer_id": "16013804|4|1644" }], [{ "hotel_id": "84011815", "city": "Dubai" }, { "hotel_id": "84011815", "offer_id": "28295947|1|1177" }, { "hotel_id": "84011815", "offer_id": "4221802|3|2319" }]]
const myArray3 = myArray1.concat(myArray2);
console.log(myArray3);
let result = [];
myArray3.forEach(function (item, idx) {
console.log(item)
result = result.concat(item);
});
console.log(result)
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@rootFeb 12.2020 — @kandre#1614467 You have to remember that sorting objects is not the same as sorting an array.

Sorting an array of objects is simpler if you have an index property or a property that you could use as an index, like a date time stamp

So where .filter and .map type functions for arrays exist, then dealing with the elements of those arrays, to sort them, you have to look at the value of one of the properties in the object of that arrya element.

So...

you have
a = [{obj:4,value:7},{obj:14,value:1},
{obj:9,value:-4},{obj:3,value:7];
You would be looking at the array element a[n] which is an object, so the a[n].obj is what you sort on, not the a[n] as it won't result in anything.

Does that clarify my response further?
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