Dataweave Series for Practice & Interview Part-3

2 min readJun 22, 2022

Practice Dataweave here :- Dataweave Playground

Important Note:- First Copy Input, Output, DW Code & Use Json Online Validator, to format the JSON, since medium changes the JSON.

Filter Duplicate Names from a String

Input:-

{
 "name": "abhi bhim cat dog cat enton abhi fom"
}

Output:-

["abhi","bhim","cat","dog","enton","fom"]

Dataweave Code:-

(payload.name splitBy(' ')) distinctBy $

2. Remove Fields(first name and last name) from an Array

{
 "fname":"a",
 "lname":"b",
 "age":"23"
}

Output:-

{
 "age": "23"
}

Dataweave Code:-

payload - "fname" - "lname"

3. Assign Incremental Key to fields in an array

Input:-

[{
 "name": "a"
 },
 {
 "name": "b"
 }
]

Output:-

[
 {
 "user1": "a"
 },
 {
 "user2": "b"
 }
]

Dataweave Code:-

payload map ((item, index) -> (
 item mapObject(v,k,i)->{
 ("user" ++ index+1):v
 }
)
)

4. Filter out blank fields from an array

Input:-

{
"arrivalDateTime": "",
"cabin": {},
"fareComponent": [],
"flightNumber": "3234",
}

Output:-

{
 "flightNumber": "3234"
}

Dataweave Code:-

payload filterObject ((value, key, index) -> sizeOf(value)!=0)

5. Convert Current Data & Time to a Specific Time Zone

Input:-

Output:-

"2022–06–22T16:42:09.980593+05:30"

Dataweave Code:-

now() >> "IST"

6. Find out Available Time Zones for Date Time Conversion

Input:-

Output:-

Dataweave Code:-

java!java::util::TimeZone::getAvailableIDs()

7. Difference between ~= and ==

Input:-

Output:-

{
 "eq1": false,
 "eq2": true,
 "eq3": false,
 "eq4": true,
 "eq5": false,
 "eq6": true
}

Dataweave Code:-

{
 "eq1": "true"==true,
 "eq2": "true"~=true,
 "eq3": "789"==789,
 "eq4": "789"~=789,
 "eq5": ["true"]==[true],
 "eq6": ["true"]~=[true]
}

8. Extract Numbers from a AlphaNumeric String

Input:-

{
 "number": "Hello612wor9ld!"
}

Output:-

["6","1","2","9"]

Dataweave Code:-

(payload.number splitBy ('')) filter (isNumeric($)==true)

9. Combine multiple objects into single object

Input:-

[
 {
 "id1":"101",
 "name1":"shubham"
 },
 {
 "id2":"102",
 "name2":"mule"
 }
]

Output:-

{
 "id1": "101",
 "name1": "shubham",
 "id2": "102",
 "name2": "mule"
}

Dataweave Code:-

payload reduce ($$ ++ $)

10. Merge Two Arrays and remove duplicates

Input:-

{
 "arr1": [1,2,3,4],
 "arr2": [2,5,6,4]
}

Output:-

[1,2,3,4,5,6]

Dataweave Code:-

(payload.arr1 ++ payload.arr2) distinctBy $

📢 Check the other Articles in the Dataweave Series:- Dataweave Series for Practice & Interview Part 1–10

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Dataweave Series for Practice & Interview Part-3

Written by Shubham Chaurasia