Transforming messages with DataWeave

          [
	{"name": "Roger"	},
	{"name": "Michael"	},
	{"name": "Harris"	}
     ]

          [
  {
    "user 1": "Roger"
  }, 
  {
    "user 2": "Micheal"
  }, 
  {
    "user 3": "Harris"
  }
        ]

%dw 2.0
output application/json
---
 
payload.name map ((item, index) ->
{
   ("user" ++" "++ index+1): item
})

%dw 2.0
output application/json
var str = [1,2,3,4,5,6,7]
var str1= [4,5,6,7,1]
---
(str ++ str1) distinctBy ((item, index) ->item )

{
        "first name": "Keith",
       "last name": "Peters",
        "age": 25
        
}

{
 "age": 25
}

%dw 2.0
output application/json
---
payload filterObject ((value, key) ->
(key as String != "first name")
and key as String !="last name")

%dw 2.0
output application/json
var arr = [1,2,3,'a','b']
---
arr-2-'b'

    [
    {"name": "Roger"    },
    {"name": "Michael"   },
    {"name": "Harris"   }
    ]

[
 {
   "Name": "ROGER"
 },
 {
   "Name": "MICHAEL"
 },
 {
   "Name": "HARRIS"
 }
]

%dw 2.0
output application/json
fun UpperCase(input_value)=upper(input_value)
---
payload map(item, index) ->
Name:UpperCase(item.name)

[
{
  "name": "Chris Jordan",
  "age": "19"
},
{
  "name": "Glenn Maxwell",
  "age": "24"
},
{
  "name": "Mike",
  "age": "20"
}
]

%dw 2.0
output application/json
---
payload filter ((item, index) ->
item.age>20)

[
{
  "name": "Chris Jordan",
  "age": "19"
},
{
  "name": "Glenn Maxwell",
  "age": "24"
},
{
  "name": "Mike",
  "age": "20"
}
]

%dw 2.0
output application/json
---
payload filter ((item, index) ->
item.age>20)
 

[
{
  "name": "Chris Jordan",
  "age": "19"
},
{
  "name": "Glenn Maxwell",
  "age": "24"
},
{
  "name": "Mike",
  "age": "20"
}
]

%dw 2.0
output application/json
---
payload orderBy ($.age)

%dw 2.0
output application/json
---
payload orderBy (-$.age)

[
{
  "name": "Chris Jordan",
  "age": null
},
{
  "name": "Glenn Maxwell",
  "age": "24"
},
{
  "name": "Lisa",
  "age": null
}
]

%dw 2.0
output application/json
skipNullOn = 'everywhere'
---
payload

{
   "filename":  "njnjnjnnjnbhbhjb/ui900jnnjn"
}

%dw 2.0
output application/json
import * from dw::core::Strings
---
substringAfterLast(payload.filename,'/')

%dw 2.0
output application/json
---
now() as LocalDateTime as String {format: "yyyy-MM-dd HH:mm:ss.S"}