Dataweave Series for Practice & Interview Part-1

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.

1. Filter Odd & Even Numbers from an Array

Input:-

[0,1,2,3,4,5,6,7,8,9]

Output:-

{
"Even": [0,2,4,6,8],
 "Odd": [1,3,5,7,9]
}

Dataweave Code:-

{
"Even": payload filter (($ mod 2)==0),
"Odd": payload filter !(($ mod 2)==0)
}

2. Interchange Key- Value in an object

Input:-

[
 {
 "message1":"Hello World"
 },
 {
 "message2":"Hello Shubham"
 }
]

Output:-

[
 {
 "Hello World": "message1"
 },
 {
 "Hello Shubham": "message2"
 }
]

Dataweave Code:-

payload map ((item, index) -> 
 item mapObject(v,k,n)-> {
 (v) : k
 }
)

3. Reverse the Words of a Sentence

Input:-

{
 "Reverse": "Dataweave 2.0 is Cool"
}

Output:-

"Cool is 2.0 Dataweave"

Dataweave Code:-

(payload.Reverse splitBy(' '))[-1 to 0] joinBy(' ')

4. Filter an Array by an Objects field Value(e.g., Year)

Input:-

[
 {
 "Product":"A",
 "Year":"2020"
 },
 {
 "Product":"B",
 "Year":"2019"
 }
]

Output:-

[
 {
 "Product": "A",
 "Year": "2020"
 }
]

Dataweave Code:-

payload filter $.Year>2019

5. Filter Even Values out from any array

Input:-

[0,1,2,3,4,5,6,7,8,9]

Output:-

[0,2,4,6,8]

Dataweave Code:-

payload filter isEven($)

6. Print Last x characters of a number or String

Input:-

[
 {
 "num":"000147"
 },
 {
 "num":"100297"
 },
]

Output:-

[
 {
 "num": "147"
 },
 {
 "num": "297"
 }
]

Dataweave Code:-

import last from dw::core::Strings
 - -
payload map(v,k)-> (num: v.num last 3)

7. Count the Number of Characters in a String

Input:-

{
 "string":"12shubham245fc"
}

Output:-

9

Dataweave Code:-

import countCharactersBy,isAlpha from dw::core::Strings
 - -
payload.string countCharactersBy isAlpha($)

8. Hamming Distance:- The Hamming distance between two equal-length strings of symbols is the number of positions at which the corresponding symbols are different

Input:-

[{
 "hola":"bola"
}
{
 "chao":"figo"
}
]

Output:-

[
 {
 "Hamming Distance": 1
 },
 {
 "Hamming Distance": 3
 }
]

Dataweave Code:-

import hammingDistance from dw::core::Strings
 - -
(payload map(v,k)->{
 (v mapObject(value,key,index)->{
 "Hamming Distance":key hammingDistance value
 })
})

9. Find Number of Object or Key-Value Pairs in an Array

Input:-

[{
 "k1":"v1"
},
{
 "k2":"v2"
}
]

Output:-

2

Dataweave Code:-

sizeOf(payload)

10. Generate Random Numbers

Input:-

[10]

Output:-

[89,26,21,77,80,31,24,13,54,55]

Dataweave Code:-

(1 to payload[0]) map randomInt(100)

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

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