Author: Suraj Rohankar
What is Filter?
- Iterates over an array and applies an expression that returns matching values.
What is Map?
- Iterates over items in an array and outputs the results into a new array.
Use Case:
A company called ABCD info systems has recorded sales. The company wants to prepare a payload to store the information in a database.
Requirement:
Payload should only contain the Transaction Date, Product Name, Price – where the price is equal to 1200, Country where sales made from United States, Canada, and Spain and payment method should only be Mastercard.
Input Payload:
| [ { “Transaction_date”: “1/2/09 6:17”, “Product”: “Product1”, “Price”: “1200”, “Payment_Type”: “Mastercard”, “Name”: “John”, “City”: “London”, “State”: “England”, “Country”: “United Kingdom”, “Account_Created”: “1/2/09 6:00”, “Last_Login”: “1/2/09 6:08” }, { “Transaction_date”: “1/2/09 4:53”, “Product”: “Product1”, “Price”: “1200”, “Payment_Type”: “Mastercard”, “Name”: “Betina”, “City”: “Parkville “, “State”: “MO”, “Country”: “United Kingdom”, “Account_Created”: “1/2/09 4:42”, “Last_Login”: “1/2/09 7:49” }, { “Transaction_date”: “1/2/09 13:08”, “Product”: “Product1”, “Price”: “1200”, “Payment_Type”: “Mastercard”, “Name”: “Federica e Andrea”, “City”: “Astoria “, “State”: “OR”, “Country”: “United States”, “Account_Created”: “1/1/09 16:21”, “Last_Login”: “1/3/09 12:32” }, { “Transaction_date”: “1/3/09 14:44”, “Product”: “Product1”, “Price”: “1200”, “Payment_Type”: “Visa”, “Name”: “Gouya”, “City”: “Echuca”, “State”: “Victoria”, “Country”: “Australia”, “Account_Created”: “9/25/05 21:13”, “Last_Login”: “1/3/09 14:22” } ] |
Dataweave Script:
| %dw 2.0 output application/json — payload filter($.Price == “1200” and ($.Country == “United Kingdom” or $.Country ==”Canada” or $.Country == “Spain”) and $.Payment_Type == “Mastercard”) map ((payload, index) -> { “Transaction_date”: payload.Transaction_date, “Product”: payload.Product, “Price”: payload.Price, “Country”: payload.Country, “Payment_Type”: payload.Payment_Type }) |
Output Payload:
| [ { “Transaction_date”: “1/2/09 6:17”, “Product”: “Product1”, “Price”: “1200”, “Country”: “United Kingdom”, “Payment_Type”: “Mastercard” }, { “Transaction_date”: “1/2/09 4:53”, “Product”: “Product1”, “Price”: “1200”, “Country”: “United Kingdom”, “Payment_Type”: “Mastercard” } ] |
Conclusion:
This article explains how we can filter out and map the data by iterating over an array.
- For more examples of MuleSoft, checkout my git repository and anypoint exchange.
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