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Showing content from https://surveyjs.io/form-library/examples/custom-variables-for-background-form-calculations/ below:

Custom Variables for Real-Time Form Calculations

Custom variables serve as intermediate or auxiliary variables that perform various calculations in the background within the survey's JSON schema as respondents answer questions. These calculations are based on expressions and support built-in and custom functions. In this demo, background calculations are used to combine a full name from the provided first and last names and to calculate a respondent's age based on their birthdate. Read more...

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