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10 Quick Dataweave Functions

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10 Quick Dataweave Functions

This quick reference collects many Dataweave functions for MuleSoft in one place, like reversing strings and flattening and trimming a payload.

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Since Dataweave is new in MuleSoft, it's hard to identify how to do some basic functions like substring reversing a string. This guide will provide all the functions in one place, which saves developers time. Below is the JSON I am using as a sample payload.

{
"firstName":"satheesh",
"lastName":"Kumar",
"age":"26",
"Amount":10.5
}

1. Substring

Most of us need to use substring somewhere in Dataweave, and it's very simple.We have to use the range operator the range can be mentioned as in array.

 firstName: payload.firstName[0..3]  will give you "firstName": "sath."

2. Reverse a String

Reversing a string is made very easy in Dataweave, so when you have a palindrome or not program next time, you don't need to use Java. You can use it directly in Dataweave.

 firstName: payload.firstName[-1..0]  will give you "firstName": "hseehtas."

3. Replace

To replace a string with another, the replace function is used.

 firstName: (payload.firstName replace "s" with "new")  will give you "firstName": "newatheenewh."

4. Identify the Size of the String

To identify the size of any value, the size of operator is used. It's not only for strings- it's for measuring arrays or lists, too.

 sizeOfFirstName: sizeOf payload.firstName  will give you "sizeOfFirstName": 8.

5. Concat

Concatenation is made very easy in Dataweave; it can be done by just using   + operator .

 Name: payload.firstName ++ " " ++ payload.lastName  will give you  "Name": "satheesh Kumar."

6. Trim

Trimming unwanted spaces is always required in integrations.

When the first name is "       satheesh," use  Name: trim payload.firstName  and it will give you "Name": "satheesh."

7. Other String Operations

I don't need to explain this as the example says everything.

Input Function Sample Result
satheesh capitalize

Name: capitalize payload.firstName

Name:Satheesh
satheesh_mule_developer camelize

Name: camelize payload.firstName

satheeshMuleDeveloper
monday tuesday dasherize

Name: dasherize payload.firstName

monday-tuesday
child

pluralize

Name: pluralize payload.firstName

children
cars singularize

Name: singularize payload.firstName

car
SAtheesh lower

Name: singularize payload.firstName

satheesh
SaTheesh upper

Name: singularize payload.firstName

SATHEESH


8. Flatten

When you have a multiple array list from multiple sources as shown below, Flatten will be very handy.

[{
"firstName":"cars",
"lastName":"Kumar",
"age":"26",
"Amount":10.5
}],
[{
"firstName":"cars",
"lastName":"Kumar",
"age":"26",
"Amount":10.5
}]

 flatten.payload  will give you

[{
"firstName":"cars",
"lastName":"Kumar",
"age":"26",
"Amount":10.5
},
 {
"firstName":"cars",
"lastName":"Kumar",
"age":"26",
"Amount":10.5
}]

9. Floor and Ceil

The Floor function will round down the decimal value into an integer and Ceil will round up the decimal value into an intenger.

"age":26.5

 age: floor payload.age  will give you 26.

 age: ceil payload.age  will give you 27.

10. Now

The Now function will give you the current date and time.

 currentTime: now  will give you "currentTime": "2016-10-20T17:15:06.196Z."

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Topics:
mulesoft ,dataweave ,esb ,cloudhub ,function composition

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