Resolving the Issue of Matrix Mutation in JavaScript with Array.fill()

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Understanding Matrix Initialization in JavaScript

The Problem Explained

Consider the following scenario:

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

Why Does This Happen?

This unexpected behavior occurs because:

Consequently, all rows refer to the exact same inner array. Thus, any modification to one of them affects all.

Updated Initialization Code

Replace the original matrix initialization with the following code:

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

Breakdown of the Solution

Array Creation:

The second argument, a mapping function, is executed for each slot in the outer array.

Inner Array Definition:

() => new Array(n).fill(0) generates a new inner array filled with zeros for each row. This ensures that each row is a unique array in memory.

Benefits of This Approach

Independent Rows: Each row in the matrix is a separate instance, meaning changes to one row do not affect others.

Maintainability: The code is easier to read and understand, allowing for better collaboration and troubleshooting.

Conclusion

Apply this knowledge in your coding practices to manage multi-dimensional arrays effectively!

Feel free to reach out with questions or share your experiences in managing arrays in JavaScript. Happy coding!