![High Order Functions
11
%dw 2.0
output application/java
var inputData = [1]
fun processArray(array, func) = array map func($)
fun incrementFunction(increment1) = (increment2) -> (increment1 + increment2)
fun incOne(param) = incrementFunction(1)(param)
fun incTwo(param) = incrementFunction(2)(param)
---
processArray(inputData,incOne) ++ processArray(inputData,incTwo) ++ processArray(inputData,incrementFunction(5))](https://image.slidesharecdn.com/20230721okcmeetupmulesoft-230722174514-b19c87e2/85/20230721_OKC_Meetup_MuleSoft-pptx-11-320.jpg)
![Function Composition
12
%dw 2.0
output application/java
var arrayInput = ["string1", "string2", "1string3"]
---
((arrayInput filter ($ contains "1"))
map (item,index) -> upper(item) ++ index)
%dw 2.0
output application/java
var arrayInput = ["string1", "string2", "1string3"]
var filterItems = (item,index) -> item contains "1"
fun upperPlusIndex(item,index) = upper(item) ++ index
---
map( filter (arrayInput,filterItems) , upperPlusIndex)
Prefix Notation
Infix Notation](https://image.slidesharecdn.com/20230721okcmeetupmulesoft-230722174514-b19c87e2/85/20230721_OKC_Meetup_MuleSoft-pptx-12-320.jpg)
![27
Dataweave Challenge!
input : [{
"message": "Hello world 1!",
"weight": 1,
"color": "red"
}
,
{
"message": "Hello world 2!",
"weight": 2,
"color": "blue"
}
,
{
"message": "Hello world 3!",
"weight": 3,
"color": "green"
}
]
output: {
"byWeight": [
{
"message": "Hello world 3!",
"weight": 3,
"color": "green"
}
],
"byColor": [
{
"message": "Hello world 2!",
"weight": 2,
"color": "blue"
}
]
}
Here is your Input Desired Output
script: %dw 2.0
output application/json
---
{
byWeight: payload filterByWeight 3,
byColor: payload filterByColor 'blue'
}
?
Send us your
Functions!](https://image.slidesharecdn.com/20230721okcmeetupmulesoft-230722174514-b19c87e2/85/20230721_OKC_Meetup_MuleSoft-pptx-27-320.jpg)
20230721_OKC_Meetup_MuleSoft.pptx
- 1. July 21, 2023 12:30pm (EST) Oklahoma City MuleSoft Meetup Group The Secrets of Dataweave
- 2. 2 ● Introductions ● Our Sponsors ● The Secrets of Dataweave ● Trivia Game ● SPECIAL Dataweave Challenge!!! ● Exciting announcements Welcome!
- 3. 3 ●Meet the Organizers: ○ Victor Felisbino ○ Ryan Hoegg ○ Diane Kesler ●Meet the Sponsors: ○ AVIO Consulting – Mike Slack ○ Hoegg Software - Ryan Hoegg Introductions Where are you joining this Meetup From?
- 4. The Secrets of Dataweave
- 5. Juan Cruz Basso Senior Software Engineer at Avio Consulting • Software Engineer • 13+ years in the world of integrations • MuleSoft Certified Developer L1/L2 • MuleSoft Certified Integration Architect • MuleSoft Certified Platform Architect • MuleSoft Mentor /jcbasso
- 6. Agenda ● Dataweave basic structure ● Functional programing principal concepts ● Functional concepts applied in Dataweave ● Modularization ● Demo ● Dataweave tips ● Q & A
- 7. Structure of a Dataweave Script ● It has a header and a body separated by (---) ○ Header: Contains language directives, such as input/output format, the version of DataWeave to execute, properties of readers/writers, and definitions of variables or functions. ○ Body: Contains the DataWeave expression that generates the output of the script. 7
- 8. Functional programming concepts ● Pure functions ● First class functions ● High order functions ● Lamda functions ● Function composition
- 9. Pure Functions %dw 2.0 output application/java fun incOne(param,param2) = param + 1 — incOne(payload,1) 9 Payload: 1 Payload: 2 incOne(1,1) Payload: 2 incOne(2,1) Payload: 3 %dw 2.0 output application/java fun incOne(param,param2) = param + 1 — payload incOne 1 Execution Nro 1 Execution Nro 2 Infix Notation Prefix Notation
- 10. First Class Functions %dw 2.0 output application/java fun incOne(param) = param + 1 fun processArray(array, func) = array map func($) — processArray(payload,incOne) 10 %dw 2.0 output application/java fun incOne(param) = param + 1 fun processArray(array, func) = array map func($) — payload processArray incOne %dw 2.0 output application/java var incOne = (param) -> param + 1 — incOne(payload) %dw 2.0 output application/java fun incOne(param) = param + 1 — payload incOne Declare a function as a variable Infix Notation Prefix Notation
- 11. High Order Functions 11 %dw 2.0 output application/java var inputData = [1] fun processArray(array, func) = array map func($) fun incrementFunction(increment1) = (increment2) -> (increment1 + increment2) fun incOne(param) = incrementFunction(1)(param) fun incTwo(param) = incrementFunction(2)(param) --- processArray(inputData,incOne) ++ processArray(inputData,incTwo) ++ processArray(inputData,incrementFunction(5))
- 12. Function Composition 12 %dw 2.0 output application/java var arrayInput = ["string1", "string2", "1string3"] --- ((arrayInput filter ($ contains "1")) map (item,index) -> upper(item) ++ index) %dw 2.0 output application/java var arrayInput = ["string1", "string2", "1string3"] var filterItems = (item,index) -> item contains "1" fun upperPlusIndex(item,index) = upper(item) ++ index --- map( filter (arrayInput,filterItems) , upperPlusIndex) Prefix Notation Infix Notation
- 13. Core Functions ● They are functions created for data transformation, and it is not necessary to explicitly import them in the scripts. ● Think of them as tools for solving different problems, there are more libraries around, but they need to be explicitly imported. ● Some commonly used core functions are: ○ map ○ filter ○ reduce ○ isEmpty ○ flatten ○ flatMap ○ pluck ○ sizeOf ○ read ○ write ○ …
- 14. Modularization ● Promotes code reusability ● Inside of them we can define functions, variables, types, or Dataweave scripts. ● Functions are imported by using the module name followed by :: ○ We can import all the elements of the module using: ■ import * from modules::utilsModule ○ We can import specific elements of the module using: ■ import numberToSAP from modules::utilsModule
- 15. Modularization in a Mulesoft API ● Promotes code reusability within the implementation of a single MuleSoft API. ● They are located within the "resources" folder of the MuleSoft application. 15
- 16. Modularization as an Exchange Library ● Promotes code reusability within the implementation of multiple MuleSoft APIs. ● They are published on Exchange. ● They are included as Maven dependencies in the project's pom.xml file.
- 17. ● MuleSoft Runtime ● CLI scripts ● Playground ● VS Code ● Dataweave in Apex (Beta) Execution contexts 17
- 18. Demo
- 19. Tips when developing with Dataweave ● Use do to create partial context of execution to define “local” variables ● Use log() to trace intermediate results of the transformations for troubleshooting ● The object destructor is a powerful tool to concatenate objects, or transform them into key/value pairs. (aka surround with () and then with {} ) ● Be aware of the in the usage of () in the correct way, the parenthesis defines the scope of the results and how the operations like ! or functions will impact.
- 20. Links ● https://dataweave.mulesoft.com ● https://docs.mulesoft.com/dataweave/2.4/dataweave-language-guide ● Core functions doc: https://docs.mulesoft.com/dataweave/2.4/dw-core ● Cheat Sheet : https://www.prostdev.com/post/dataweave-2-0-core-functions-cheatsheet ● Memory management : https://docs.mulesoft.com/dataweave/2.4/dataweave-memory- management#buffersize ● Dataweave in Apex (Beta): https://developer.salesforce.com/docs/atlas.en- us.apexcode.meta/apexcode/DataWeaveInApex.htm
- 21. Trivia Game!
- 22. 22 Trivia Game Three winners of today’s trivia receives: A $30 Gift Card! ● Remember: ○ The first correct answer wins! ○ You can only receive 1 Gift Card ● Gift Cards are sponsored by
- 23. 23 1. How many parameters should have a function to be used with an infix notation? A. 1 B. 3 C. 2 D. any Trivia Question 1
- 24. 24 2. How many functions can I pass as parameters in a function in Datawave? A. 1 B. any C. 2 D. 0 Trivia Question 2
- 25. 25 3. When a function is a first-class function in a programming language? A. when it flights only in first class B. when it's the first function written in the code C. when it can be treated as an object ( having the same "privileges" ) D. when it's the first function called of a program Trivia Question 3
- 27. 27 Dataweave Challenge! input : [{ "message": "Hello world 1!", "weight": 1, "color": "red" } , { "message": "Hello world 2!", "weight": 2, "color": "blue" } , { "message": "Hello world 3!", "weight": 3, "color": "green" } ] output: { "byWeight": [ { "message": "Hello world 3!", "weight": 3, "color": "green" } ], "byColor": [ { "message": "Hello world 2!", "weight": 2, "color": "blue" } ] } Here is your Input Desired Output script: %dw 2.0 output application/json --- { byWeight: payload filterByWeight 3, byColor: payload filterByColor 'blue' } ? Send us your Functions!
- 28. What’s Next?
- 29. ● Share: ○ Tweet using the hashtag #MuleSoftMeetups ○ Invite your network to join: https://meetups.mulesoft.com/oklahoma-city/ ○ Want to be a Speaker? Let us know at: ● Feedback: ○ Fill out the survey feedback – Win MuleSoft Swag! Drawing from completed surveys ○ Suggest topics for upcoming events: What are YOUR requests? ○ Contact MuleSoft at [email protected] for ways to improve the program 29 What’s next?
- 30. 30 We are here to help YOU!
- 32. Thank you & See you next time!