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19 - Lone Empty Parameter and Result
Use checkParam_empty() to verify that a lone parameter or return result is not empty. Good for ensuring that a function's single string, array, and object parameter and or result has a useful value. When a parameter corresponds to 'EMPTY-ERROR' and its contents are valueless then an error is returned, which causes the PRE_check function to throw an exception or console log the error.
Empty or
Valueless Data
  • null
  • undefined
  • "" - empty string
  • NaN - not a number
  • [ ] - no elements in array
  • { } - no members in object
  • new Date("")
  • new RegExp("") or /(?:)/
  • Empty Categories
  • 'EMPTY-OK'
    Valueless variable is ok
  • 'EMPTY-ER' Valueless
    variable is an Error
  • 'EMPTY-IGNORE'   Functions, Symbols, BigInts,
    • and Booleans cannot be empty; a hint

Generally only 'EMPTY-ER' is very useful.

Console Output