Swift - Merging 2 arrays of objects with a key

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By : user3099393

Date : January 11 2021, 03:32 PM

fixed the issue. Will look into that further I'm new to Swift programming and been working on an app fir a couple of weeks now, and I'm stuck at a crucial moment in the development. , I figure it out!

code :

        for mergedI in mergeInformationList {
            for mergedD in mergeDataList {
                if mergedI.id == mergedD.id {
                    self.mergedList.append(MergedViewModel(data: mergedD, information: mergedI))

                }
            }
        }

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Merging two arrays of objects

By : sunshine21

Date : March 29 2020, 07:55 AM

hope this fix your issue You can achieve this using jQuery extend if that's an option.

code :

var extendedArray = $.extend({}, arr1, arr2);

$.extend(arr1, arr2);

JavaScript Merging 3 Arrays of Objects into 1 Array of Objects by ID and Name

By : Nelson Rodriguez Ros

Date : March 29 2020, 07:55 AM

like below fixes the issue There are a number of ways you could do this. Here is a very old-school but fast way to do it. It involves two steps:
Take all the arrays and merge them into an object using the specified key ('Client ID' in this example). Take that merged object and convert it back to an array.

code :

var arr1 = [
{"Client ID":"1", "Client Name":"ABC", D1:"some data", D2:"more data"},
{"Client ID":"2", "Client Name":"DEF", D1:"some data", D2:"more data"},
{"Client ID":"3", "Client Name":"GHI", D1:"some data", D2:"more data"}
];

var arr2 = [
{"Client ID":"1", "Client Name":"ABC", D3:"and more data", D4:"more more data"},
{"Client ID":"2", "Client Name":"DEF", D3:"and more data", D4:"more more data"},
{"Client ID":"3", "Client Name":"GHI", D3:"and more data", D4:"more more data"}
];

var arr3 = [
{"Client ID":"1", "Client Name":"ABC", D5:"other data", D6:"extra Data"},
{"Client ID":"2", "Client Name":"DEF", D5:"other data", D6:"extra Data"},
{"Client ID":"3", "Client Name":"GHI", D5:"other data", D6:"extra Data"}
];

console.log( mergeArrays( 'Client ID', [ arr1, arr2, arr3 ] ) );

function mergeArrays( key, arrays ) {
    // First merge the arrays into an object
    // indexed by the specified key
    var merged = {};
    arrays.forEach( function( array ) {
        array.forEach( function( item ) {
            var id = item[key];
            var target = merged[id];
            if( ! target ) target = merged[id] = {};
            for( var name in item ) {
                if( item.hasOwnProperty(name) ) {
                    target[name] = item[name];
                }
            }
        });
    });
    // Now convert the merged object back to an array
    var result = [];
    for( var id in merged ) {
        if( merged.hasOwnProperty(id) ) {
            result.push( merged[id] );
        }
    }
    return result;
}

Transform multiple arrays of objects into a single array while merging the objects on common key

By : Caio Cesar

Date : March 29 2020, 07:55 AM

will help you Try following
Create an object with date as key and corresponding resulting object as value. And using Object.values get the final result To build the object, use Array.reduce on outer array and for each value of inner array, check whether the entry for date exists or not in object. If it exists update it else create a new entry in object. For each object in inner array, sum the values of all keys except date and set it in object corresponding to the customer name key.

code :

const myArray = [{values: [{ date: "2018-11-02", "value1": 3, "value2": 5 },{ date: "2018-11-01", "value1": 8, "value2": 9 },{ date: "2018-10-31", "value1": 4, "value2": 10 },],customer: "Customer One"},{values: [{ date: "2018-11-02", "value1": 3 },{ date: "2018-11-01", "value1": 5 },{ date: "2018-10-31", "value1": 8 },],customer: "Customer Two"}];

let result = Object.values(myArray.reduce((a,c) => {
  c.values.forEach(({date, ...rest}) => {
    a[date] = a[date] || {date};
    a[date][c.customer] = Object.values(rest).reduce((d,e) => d + e);
  });
  return a;
}, {}));
console.log(result);

Merging 2 arrays of objects to create a Map of Objects

By : ben leppard

Date : March 29 2020, 07:55 AM

help you fix your problem You could iterate the outer object's keys and then the inner arrays. If an result object does not exist, create one with the wanted keys and zero values.

Merging two arrays of structures using iOS swift

By : D shokry

Date : March 29 2020, 07:55 AM

This might help you How can I merge two (first and second) arrays of structures based on a key in structure (name). While merging I need to replace the existing element of first array with second array element, if any value changed in that element.

code :

import Foundation

struct Example: Codable {
    var name: String
    var dob: String
    var address: String
}

var first: [Example] = []
var second: [Example] = []

first.append(Example(name: "Arun", dob: "01-01-1994", address: "Tirupati"))
first.append(Example(name: "Balaji", dob: "01-01-1994", address: "Tirupati"))
first.append(Example(name: "Prasanth", dob: "01-01-1994", address: "Tirupati"))

second.append(Example(name: "Arun", dob: "01-01-1994", address: "Kadapa"))
second.append(Example(name: "Balaji", dob: "01-01-1994", address: "Tirupati"))
second.append(Example(name: "Prasanth", dob: "01-01-1994", address: "Tirupati"))
second.append(Example(name: "Harsha", dob: "01-01-1994", address: "Tirupati"))

first = second + first.filter { element in
    return !second.contains { $0.name == element.name }
}