3 Ways to Convert an Array to an Object in NodeJS

Let’s get started!

Table of Contents

1. Object.assign()
2. Loop Over Array & Construct a New Object
3. Reduce()

1. Object.assign()

Object.assign() is the first method we’ll cover. This method is used to copy values from one or more source objects to a target object.

 const array = ["Johnny", "Billy", "Sandy"]

const newObject = Object.assign({}, array)

// newObject = { "0": "Johnny", "1": "Billy", "2": "Sandy" }

2. Loop Over Array & Construct a New Object

In this method, we’re going to loop over each item in your array and add each one as a new property in a new object.

Here’s the full code:

const array = ["Johnny", "Billy", "Sandy"]

let newObject = {}

for (let i=0; i < array.length; i++) {
  if (array[i] !== undefined) {
    newObject[i] = array[i]
  }
}

// newObject = { "0": "Johnny", "1": "Billy", "2": "Sandy" }

First, we declare an empty object called newObject that will hold the properties we will move over from the array.

Then, we use a for loop to iterate over each value in the array. If the value doesn’t have an undefined value, we add the value as a new property to the newObject.

3. Reduce()

The last example is the reduce() method. Reduce() method executes a provided function for each value of the array and the return values are stored in an accumulator, which is an object in this case.

const array = ["Johnny", "Billy", "Sandy"]

const newObject = array.reduce(function(result, item, index) {
  result[index] = item
  return result
}, {})

// newObject = { "0": "Johnny", "1": "Billy", "2": "Sandy" }

Conclusion

Did we miss a method you use? Let us know in the comments.

Thanks for reading and happy coding!

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Originally published by Nick Major at https://coderrocketfuel.com

#node-js #arrays