Merging arrays with a shared key value

I have two arrays of objects and I need to merge them based on matching names. What is the most efficient way to accomplish this with minimal code?

firstArray = [
              {name: "Henry", balance: 2176.90, Age: 26},
              {name: "Jon", balance: 122.10, Age: 31},
              {name: "Dave", balance: 258.23, Age: 42},
              {name: "Tom", balance: 591.00, Age: 19},
              {name: "Mary", balance: 12.54, Age: 56},
              {name: "Rick", balance: 5287.25, Age: 29},
              {name: "Jane", balance: 6527.20, Age: 24}
           ]

secondArray = [
              {user: "Henry", city: "New York", dept: "Sales"},
              {user: "Vanessa", city: "New York", dept: "Sales"},
              {user: "Susan", city: "Dallas", dept: "Marketing"},
              {user: "Jon", city: "New York", dept: "Management"},
              {user: "Dave", city: "Dallas", dept: "Marketing"}
              {user: "Jay", city: "Spokane", dept: "IT"}
           ]

secondArray = [
              {user: "Henry", city: "New York", dept: "Sales", balance: 2176.90},
              {user: "Vanessa", city: "New York", dept: "Sales", balance: "N/A"},
              {user: "Susan", city: "Dallas", dept: "Marketing", balance: "N/A"},
              {user: "Jon", city: "New York", dept: "Management", balance: 122.10},
              {user: "Dave", city: "Dallas", dept: "Marketing", balance: 258.23}
              {user: "Jay", city: "Spokane", dept: "IT", balance: 591.00}
           ]

Answer №1

The most efficient way to handle this situation is by looping over the arrays.

for (let element in firstArray) {
    let obj = firstArray[element];
    for (let item in secondArray) {
        let obj2 = secondArray[item];
        if (obj['user'] == obj2['user']){
            //perform merging operation here
            secondArray[item]['balance'] = obj['balance'];
            break; //stop iteration once match is found
        }
    }
    // additional operations can be done here
}

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