APPEND

Joins two pieces of text together.

Syntax 

APPEND(text1, text2)

Examples 

Example 1

Input

{
  "my_action": {
    "message": "/my/fancy/url"
  }
}

Formula

APPEND(my_action.message, ".html")

Output

"/my/fancy/url.html"
Example 2

Alternatively, you can used the concatenation operator:

Input

{
  "my_action": {
    "message": "/my/fancy/url"
  }
}

Formula

my_action.message & ".html"

Output

"/my/fancy/url.html"