TS function with dynamic keys

TS function with dynamic keys

When working with TypeScript, you may come across situations where you need to define a function that accepts an object with dynamic keys. This means that the keys of the object can vary and are not known in advance. In this blog post, we will explore different solutions to handle this scenario.

Solution 1: Using an index signature

One way to define a function with dynamic keys is by using an index signature. An index signature allows you to specify that an object can have any key of a certain type. Here’s an example:

function processObject(obj: { [key: string]: any }) {
  // Access the dynamic keys using obj[key]
  for (let key in obj) {
    console.log(key + ": " + obj[key]);
  }
}

// Usage
const obj = {
  key1: "value1",
  key2: "value2",
  key3: "value3"
};

processObject(obj);

This solution allows you to pass an object with any keys to the processObject function. The function then iterates over the keys and logs the key-value pairs to the console.

Solution 2: Using generics

Another approach is to use generics to define a function with dynamic keys. Generics allow you to create reusable functions or classes that can work with a variety of types. Here’s an example:

function processObject(obj: T) {
  // Access the dynamic keys using obj[key]
  for (let key in obj) {
    console.log(key + ": " + obj[key]);
  }
}

// Usage
const obj = {
  key1: "value1",
  key2: "value2",
  key3: "value3"
};

processObject(obj);

In this solution, we define a generic type parameter T that extends an object with dynamic keys. This allows us to pass an object of any type to the processObject function. The function then iterates over the keys and logs the key-value pairs to the console.

Conclusion

When you need to work with a function that accepts an object with dynamic keys in TypeScript, you have multiple solutions at your disposal. You can use an index signature or generics to handle this scenario. Choose the solution that best fits your specific use case and enjoy the flexibility of working with dynamic keys in TypeScript.

That’s it for this blog post! We hope you found it helpful in understanding how to define a TS function with dynamic keys. If you have any questions or suggestions, feel free to leave a comment below. Happy coding!