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- String Helper Functions

- # IsString()

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  Lua SwxWare v13.10

  This helper function checks if the given parameter is of type string.

      local bString = IsString(str)

  This function returns a boolean value.

  Examples:

      local bString = IsString("I am a string")

      PBXScript.OutputTrace("bString = " .. tostring(bString))

      --> bString = true

      local bString = IsString(12345)

      PBXScript.OutputTrace("bString = " .. tostring(bString))

      --> bString = false

  By Tom Wellige

  - June 9, 2022
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