How to Update a Property in a JSON Array using Ramda.js

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The Challenge

Consider the following example where we have an array of objects, each containing a message property. We want to identify a specific substring of the message, say "C1", and update the string accordingly or set it to null if it doesn’t match our criteria.

Input Data

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

Expected Output

After processing the above input, we want the output to be:

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

Solution Walkthrough

Step 1: Understanding the Required Functions

map: Transforms a list by applying a function to each element.

evolve: Transforms the properties of an object based on a provided specification.

pipe: Composes functions together, passing the result of one function as the input to the next.

match: Matches a string against a regular expression and returns the results.

ifElse: Executes one of two functions based on a condition.

isEmpty: Checks if a list is empty.

always: Always returns the same value.

head: Returns the first element of a list.

Step 2: Implementing the Functionality

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

Step 3: Dynamic Usage of Regular Expressions

For more flexibility, you can customize the regular expression as a parameter. Here’s how:

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

Explanation of the Code

We start by requiring necessary functions from Ramda.

Define a function fn to transform the message property.

Use regular expressions to match the desired substring.

Depending on whether a match is found, we assign the first match or null.

Conclusion

Feel free to experiment with the above examples and modify them to suit your specific needs!