Скачать или смотреть How to Execute Multiple Functions Using Map in React JS

Learn how to efficiently trigger multiple functions based on array values in React JS. Get step-by-step guidance with practical code examples.
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How to Execute Multiple Functions Using Map in React JS

Working with arrays is a common task in programming, especially in the context of React. One situation that developers often encounter is the need to execute different functions based on the values contained in an array. This post will guide you through how to achieve this in React JS, using a clear example.

The Challenge

Imagine you have an array that might look something like this:

[[See Video to Reveal this Text or Code Snippet]]

Your goal is to call specific functions every time you encounter the string "save" and a different function when you encounter the string "not". However, the current implementation of your function seems to execute only once, which isn't the desired behavior.

Understanding the Original Code

Here's the piece of code you have so far:

[[See Video to Reveal this Text or Code Snippet]]

What's Wrong Here?

Limited Function Invocation: The function this.check(el) is being called only once for each element of the array, but if your array has multiple entries of "save", it may not be processing them the way you expect.

Usage of componentWillMount: This lifecycle method is deprecated in React. It is advisable to use componentDidMount instead, which ensures that the component is mounted and ready for data manipulation.

The Solution

To ensure that your functions are executed for every matching entry in the array, you can refactor your code as follows:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Refactor

Using forEach: This method iterates over each element in the tests array, allowing you to call your functions as many times as the specific string appears in the array.

Logging: The console.log(test); line is useful for debugging, ensuring that you are capturing the correct values from the array.

Clear Functions: By using explicit checks for "save" and "not", you ensure that the right function is called based on the value.

Conclusion

By following the above methods, you can easily execute multiple functions in React JS based on values in an array. This not only improves the efficiency of your code but also adheres to modern React practices. Refactoring your code to utilize componentDidMount and forEach allows for more flexibility and better functionality, ensuring your application behaves as expected when dealing with various inputs.

Now you can harness the full potential of your React applications with this effective strategy! Keep building, and happy coding!