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Summary: Learn how to create objects with dynamic keys in JavaScript, a powerful technique for handling flexible and dynamic data structures. Discover practical examples and best practices.
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Creating Objects with Dynamic Keys in JavaScript

In JavaScript, creating objects with dynamic keys is a powerful technique that allows developers to handle flexible and dynamic data structures. This capability is especially useful when the keys of an object are not known until runtime. This guide will guide you through various methods to create objects with dynamic keys in JavaScript.

Using Computed Property Names

One of the most straightforward ways to create objects with dynamic keys is by using computed property names. This feature, introduced in ES6, allows you to use expressions as property names inside object literals.

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In this example, the dynamicKey variable is used as the key for the obj object. The value of dynamicKey is evaluated and set as the property name.

Using the Object.assign() Method

Another method to create objects with dynamic keys is by using the Object.assign() method. This method copies all enumerable own properties from one or more source objects to a target object.

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Here, an empty object {} is the target object, and the source object { [dynamicKey]: dynamicValue } is merged into it.

Using Bracket Notation

Bracket notation is a classic approach that allows you to add properties to an object dynamically.

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This method is straightforward and often used when the keys are determined at runtime.

Using reduce() to Create Objects from Arrays

If you have an array of keys and values, you can use the reduce() method to create an object with dynamic keys.

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In this example, the reduce() method iterates over the keys array and constructs an object with the corresponding values from the values array.

Using ES6 Map and Object.fromEntries()

You can also use an ES6 Map and the Object.fromEntries() method to create objects with dynamic keys.

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This approach is useful when dealing with key-value pairs and converting them into an object.

Conclusion

Creating objects with dynamic keys in JavaScript is a versatile technique that can be accomplished in multiple ways. Whether you prefer computed property names, Object.assign(), bracket notation, reduce(), or Object.fromEntries(), each method has its use cases and advantages. Understanding these methods will enable you to handle dynamic data structures more effectively and write more flexible JavaScript code.