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.
Join the DZone community and get the full member experience.
Join For FreeSince 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."
Opinions expressed by DZone contributors are their own.
Comments