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How to Merge Keys Array and Values Array into an Object in JavaScript?

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To merge keys array and values array into an object in JavaScript, we can use the JavaScript array’s reduce method.

For instance, we write:

const keys = ['height', 'width'];
const values = ['1px', '2px'];
const merged = keys.reduce((obj, key, index) => ({
  ...obj,
  [key]: values[index]
}), {});
console.log(merged)

We have the keys and values array that has the property keys and their corresponding values.

Next, we call keys.reduce with a callback to get the key and put the key as the property name.

And the values[index] value is set as the value of [key].

We then return that object.

The 2nd argument of reduce is an empty object so obj is set to an empty object initially.

Therefore, merged is:

{height: "1px", width: "2px"}

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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