Creating Diagnostic Messages

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Information can be shown in a message box. For example, the following checks to see if a variable called weight exists and, if it does not, alerts the user:

if (data_file.getVariableByName("weight") == null) 
   alert("Data file does not contain a variable called 'weight'.");

Alternatively, we can print messages in an output windows. The following prints the value of Don’t know (see the earlier example in this chapter):

log("Don't know in the age question has the value of " + dk_value);

See also