CODEWITHSUNDEEP
javascriptarraysreactjs
Quentin
Quentin

Reputation: 371

How to merge two arrays of objects in ReactJS?

I have two arrays of objects that I need to merge together to only get one array of object. There is a lot of objects, both have more than 500+ objects

This is an exemple of the structure of the two array of objects :

let API = [
  {
    actif: true,
    id: 8,
    creation_user: "David",
    date_creation: "févr  4 2022 12:17PM",
    description: "A description",
    version: "v1r1"
  },
  {
    actif: true,
    id: 10,
    creation_user: "Julien",
    date_creation: "févr  10 2022 12:17PM",
    description: "A description",
    version: "v1r2"
  },
  {
    actif: false,
    id: 20,
    creation_user: "Tom",
    date_creation: "févr  10 2022 12:17PM",
    description: "A description",
    version: "v1r2"
  }
]

let Parameters = [
  {
    id: 10,
    name: "codeRR",
    type: "string"
  },
  {
    id: 20,
    name: "codeAA",
    type: "string"
  },
  {
    id: 20,
    name: "codeCC",
    type: "string"
  }
]

As we can see, they both have an ID, this ID is the same in both arrays. But not everytime, API can have no parameter.

What i'm trying to achieve is to get in the second array, the "name" and "type", and to add it to the first array (or in a new array).

I've tried with .map on the first array (also tried with the second one) :

let Ressource = api.map(item => Object.assign({}, item, parametre.find(target => target.id === item.id)));
 
 // Result of Ressource
 
 [
  {
    actif: true,
    id: 8,
    creation_user: "David",
    date_creation: "févr  4 2022 12:17PM",
    description: "A description",
    version: "v1r1";
    name: "codeRR",
    type: "string
  }
 ]
 
 // Want I want :
 [
  {
    actif: true,
    id: 8,
    creation_user: "David",
    date_creation: "févr  4 2022 12:17PM",
    description: "A description",
    version: "v1r1",
    parameter: [
      {
        name: "codeRR",
        type: "string
      },
      {
        name: "codePP",
        type: "string
      }
    ]
  }
 ]

But when an API have multiple parameter it overwrite the previous one. Is it possible to make something like this in my API

parameter: [{"name": "codeRR", type: "string"}, {"name": "codePP", "type": "string"}]

Upvotes: 0

Views: 613

Answers (3)

Som Shekhar Mukherjee
Som Shekhar Mukherjee

Reputation: 8168

  1. Group the Parameters array by their id using Array.prototype.reduce, this would give an object where the keys are the ids and the values are an array of parameter objects.

  2. Loop over the API array and using the object created above add the parameter property wherever the parameter information is available.

let 
  API = [
    { actif: true, id: 8, creation_user: "David", date_creation: "févr  4 2022 12:17PM", description: "A description", version: "v1r1" },
    { actif: true, id: 10, creation_user: "Julien", date_creation: "févr  10 2022 12:17PM", description: "A description", version: "v1r2" },
    { actif: false, id: 20, creation_user: "Tom", date_creation: "févr  10 2022 12:17PM", description: "A description", version: "v1r2" },
  ],
  Parameters = [
    { id: 10, name: "codeRR", type: "string" },
    { id: 20, name: "codeAA", type: "string" },
    { id: 20, name: "codeCC", type: "string" },
  ],
  ParametersGroup = Parameters.reduce((r, p) => ((r[p.id] ??= []).push(p), r), {}),
  APIWithParams = API.map((o) => ({
    ...o,
    ...(ParametersGroup[o.id] && { parameters: ParametersGroup[o.id] }),
  }));

console.log(APIWithParams);

If you want to handle single parameter and multiple parameters differently, then refer to the solution below:

let 
  API = [
    { actif: true, id: 8, creation_user: "David", date_creation: "févr  4 2022 12:17PM", description: "A description", version: "v1r1" },
    { actif: true, id: 10, creation_user: "Julien", date_creation: "févr  10 2022 12:17PM", description: "A description", version: "v1r2" },
    { actif: false, id: 20, creation_user: "Tom", date_creation: "févr  10 2022 12:17PM", description: "A description", version: "v1r2" },
  ],
  Parameters = [
    { id: 10, name: "codeRR", type: "string" },
    { id: 20, name: "codeAA", type: "string" },
    { id: 20, name: "codeCC", type: "string" },
  ],
  ParametersGroup = Parameters.reduce((r, p) => ((r[p.id] ??= []).push(p), r), {}),
  APIWithParams = API.map((o) => {
    const paramsForId = ParametersGroup[o.id];
    return {
      ...o,
      ...(paramsForId && (paramsForId.length > 1 ? { parameters: paramsForId } : paramsForId[0])),
    };
  });

console.log(APIWithParams);

Note: Finding the parameter for an id again and again is not optimal. Hence we've created an object beforehand and referenced it while adding the parameter information.

Other relevant documentations:

Upvotes: 1

Nick Vu
Nick Vu

Reputation: 15540

You're almost there. You can add extra logic for your map to handle multiple and single parameters separately.

let API = [{
    actif: true,
    id: 8,
    creation_user: "David",
    date_creation: "févr  4 2022 12:17PM",
    description: "A description",
    version: "v1r1"
  },
  {
    actif: true,
    id: 10,
    creation_user: "Julien",
    date_creation: "févr  10 2022 12:17PM",
    description: "A description",
    version: "v1r2"
  },
  {
    actif: false,
    id: 20,
    creation_user: "Tom",
    date_creation: "févr  10 2022 12:17PM",
    description: "A description",
    version: "v1r2"
  }
]

let Parameters = [{
    id: 10,
    name: "codeRR",
    type: "string"
  },
  {
    id: 20,
    name: "codeAA",
    type: "string"
  },
  {
    id: 20,
    name: "codeCC",
    type: "string"
  }
]

const result = API.map((data) => {
  const updatedData = Object.assign({}, data)
  const foundParameters = Parameters.filter(({
    id
  }) => id === data.id)
  if (foundParameters.length === 0) {
    return data
  }

  if (foundParameters.length === 1) {
    return Object.assign(updatedData, foundParameters[0])
  } else {
    return Object.assign(updatedData, {
      parameter: foundParameters.map(({
        name,
        type
      }) => ({
        name,
        type
      }))
    })
  }
});

console.log(result)

Upvotes: 1

R4ncid
R4ncid

Reputation: 7139

If the parameters have the same attributes they will be overwritten.

if you need both of them you need to store them in an array

like this

const decorate = (data, parameters) => data.map(d => ({...d, parameters: parameters.filter(({id}) => d.id === id)}))




let API = [
  {
    actif: true,
    id: 8,
    creation_user: "David",
    date_creation: "févr  4 2022 12:17PM",
    description: "A description",
    version: "v1r1"
  },
  {
    actif: true,
    id: 10,
    creation_user: "Julien",
    date_creation: "févr  10 2022 12:17PM",
    description: "A description",
    version: "v1r2"
  },
  {
    actif: false,
    id: 20,
    creation_user: "Tom",
    date_creation: "févr  10 2022 12:17PM",
    description: "A description",
    version: "v1r2"
  }
]

let Parameters = [
  {
    id: 10,
    name: "codeRR",
    type: "string"
  },
  {
    id: 20,
    name: "codeAA",
    type: "string"
  },
  {
    id: 20,
    name: "codeCC",
    type: "string"
  }
]

console.log(decorate(API,Parameters ))

Upvotes: 1

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