How to check if the given string a palindrome? in MuleSoft
Here's how to check if a given string is a palindrome in MuleSoft using DataWeave:
1. Function Approach:
This method involves creating a reusable function to perform the palindrome check.
%dw 2.0
fun isPalindrome(text: String): Boolean {
// Remove non-alphanumeric characters and convert to lowercase
var cleanText = text.replace(/[^\w\s]/g, "").toLowerCase()
// Check if the reversed string is equal to the original string (ignoring whitespaces)
cleanText == cleanText.reverse().replace(/\s/g, "")
}
---
output = isPalindrome("race car") // returns true
Explanation:
The isPalindrome function takes a string as input (text).
It removes non-alphanumeric characters using a regular expression (/[^\w\s]/g) and converts the text to lowercase for case-insensitive comparison.
The function then checks if the reversed string (cleanText.reverse()) is equal to the original cleaned string after removing whitespaces (replace(/\s/g, "")).
The function returns true if it's a palindrome, false otherwise.
2. Inline Expression:
For a one-time check, you can use a DataWeave expression directly within your flow.
%dw 2.0
---
message.payload == message.payload.reverse().replace(/\s/g, "")
Explanation:
This expression compares the original payload string with its reversed version after removing whitespaces.
It directly evaluates to true if it's a palindrome, false otherwise.
Choosing the Right Approach:
Function: This approach is preferred for reusability, especially if you need to perform the palindrome check in multiple places within your Mule application.
Inline expression: This method is suitable for simple, one-time checks where creating a separate function might be overkill.
Additional Notes:
You can modify the regular expression in the function to handle specific requirements, like including punctuation or spaces in the palindrome check.
Error handling can be incorporated to gracefully handle situations where the input might not be a string.
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