How do I create a JavaScript array dynamically?

1 Answer

answered Mar 31, 2021 by dhanush (13.1k points)

Consider the array of objects:

var someData = [
   {firstName: "Max", lastName: "Mustermann", age: 40},
   {firstName: "Hagbard", lastName: "Celine", age: 44},
   {firstName: "Karl", lastName: "Koch", age: 42},
];

Using for..in:

var employees = {
    accounting: []
};
for(var i in someData) {
    var item = someData[i];
    employees.accounting.push({
        "firstName" : item.firstName,
        "lastName" : item.lastName,
        "age" : item.age
    });
}

Or by using Array.prototype.map():

var employees = {
    accounting: []
};
someData.map(function(item) {
   employees.accounting.push({
        "firstName" : item.firstName,
        "lastName" : item.lastName,
        "age" : item.age
    });
}

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