Set Variable

Set Variable

Type: set-variable  ·  Package: Core Activities v1.0.0

Assigns a value to a variable. It is the activity with which you create or update data by hand within the flow: initialize a counter, accumulate a text, save the result of a calculation, or change the value of a variable depending on what happens.

Unlike activities that store their result in an Output field, Set Variable exists precisely to assign a value that you define using an expression.

How it works

You indicate the name of the destination variable and the value. When executed, it evaluates the value (literal or expression =) and saves it in that variable, overwriting whatever it had. If the variable does not exist, it is declared automatically.

Required parameters

Parameter	Editor	Description
name	nombre de variable	The variable to assign. A valid name (no spaces or accents).
value	expression	The value to save. Literal or expression =.

Optional parameters

Ninguno.

Examples

Initialize a counter and then increment it (typical pattern inside a loop):

Set Variable   name = contador   value = 0
...
For Each   items = = facturas   itemVariable = factura
 └─ activities:
      Set Variable   name = contador   value = = contador + 1

Accumulate a total:

Set Variable   name = total   value = = total + num(fila["Monto"])

Build a flag based on a condition:

Set Variable   name = requiereRevision   value = = total > 1000000

Set Variable or the Output field?

To save the result of an activity (an Excel read, an HTTP response), use the Output field of that activity — it’s more direct. Use Set Variable when you define the value with an expression or when you need to modify an existing variable.

Common errors

Symptom	Causa	Solution
The value is saved as text =a+b	You forgot that value needs the = to evaluate	Prepend = so that it is an expression, not a literal
Variable no declarada en modo estricto	The name does not match an existing variable	Check the exact name (case sensitive)

Related activities

• Variables — how they are declared and their scope.
• Expressions — what you can calculate in value.