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# getSessionVar

The `getSessionVar` method gets the value of a conversation session variable.

You define session variables in your task configuration JSON file, by creating a task requirement with the `scope` property set to session.

## Syntax

    getSessionVar( key )

## Arguments

Argument | Description
--- | ---
`key` | (string) The ID of the session variable for which you want to retrieve the value.

## Returns

(strings) The value of the session variable.

This method can return nil if the value is not set.

## Example

    function greet(taskUtils)
       local username = taskUtils:getSessionVar("USER_NAME")
       local prompt = LuaUserPrompt:new(string.format("Hello %s", username))
       taskUtils:setPrompts(
          {prompt}
       )
    end

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