Filter array of objects by a specific property in JavaScript?

Use the concept of map() along with ternary operator (?). Following are our array of objects −

let firstCustomerDetails =
[
   {firstName: 'John', amount: 100},
   {firstName: 'David', amount: 50},
   {firstName: 'Bob', amount: 80}
];
   let secondCustomerDetails =
[
   {firstName: 'John', amount: 400},
   {firstName: 'David', amount: 70},
   {firstName: 'Bob', amount: 40}
];

Let’s say, we need to filter array of objects by amount property. The one with the greatest amount is considered.

Example

let firstCustomerDetails =
[
   {firstName: 'John', amount: 100},
   {firstName: 'David', amount: 50},
   {firstName: 'Bob', amount: 80}
];
let secondCustomerDetails =
[
   {firstName: 'John', amount: 400},
   {firstName: 'David', amount: 70},
   {firstName: 'Bob', amount: 40}
];
var output = firstCustomerDetails.map((key, position) =>
key.amount > secondCustomerDetails[position].amount ? key :
secondCustomerDetails[position]
);
console.log(output);

To run the above program, you need to use the following command −

node fileName.js.

Here, my file name is demo83.js.

Output

This will produce the following output −

PS C:\Users\Amit\JavaScript-code> node demo83.js
[
   { firstName: 'John', amount: 400 },
   { firstName: 'David', amount: 70 },
   { firstName: 'Bob', amount: 80 }
]