Adding date restrictions to the main method is necessary for controlling the input and output

I have a function in my react-native package that requires "from" and "to" dates as parameters.
I need to implement a rule that ensures the "to" date is always after the "from" date.
Where should I insert this requirement in the following code snippet?

const fetchData: fetchDataMethod = async (                //function definition
  identifier,
  options
) => {
  const processedOptions = processInput(options)
  return processedOptions
}

const processInput = (options: InputParameters) => {        //processing input function
  const limit = options.limit ?? 0
  const ascending = options.ascending ?? true

  const from = convertDateToString(options.from)
  const to = convertDateToString(options.to)

  return { limit, ascending, from, to }
}

const convertDateToString = (date?: Date | null): string => {       //convert date to string function
  return date ? date.toISOString() : new Date(0).toISOString()
}

export type InputParameters = {      //type declaration
  from?: Date
  to?: Date
  limit?: Number
  ascending?: boolean
};

Answer №1

If you're looking to improve your prepareInput function, consider implementing the following logic:

  const fromDate = options.from
  const toDate = options.to
  
  
  let from = dateToString(options.from)
  let to = dateToString(options.to)
  
  if toDate < fromDate {
    from = dateToString(options.to)
    to = dateToString(options.from)
  }
  
  
 

This will ensure that the toDate is always the larger value. If this doesn't meet your requirements, you may need to add additional validation elsewhere. For instance, if your input values are coming from textFields, consider implementing the necessary validation directly in those fields.

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