Wrap Object Properties of Type String with Arrays in JavaScript

For this, use Object.keys() along with reduce(). To display the result, we will also use concat().

Example

Following is the code −

var details = { name: ["John", "David"], age1: "21", age2: "23" },
   output = Object
      .keys(details)
      .reduce((obj, tempKey) =>
         (obj[tempKey] = [].concat(details[tempKey]), obj), {})
console.log(output)  

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

node fileName.js.

Here, my file name is demo302.js.

Output

This will produce the following output on console −

PS C:\Users\Amit\javascript-code> node demo302.js
{ name: [ 'John', 'David' ], age1: [ '21' ], age2: [ '23' ] }