Check if all given strings are empty

Summary

The isempty macro checks if all provided arguments are empty strings. Returns true only if all values are empty, false otherwise.

Syntax 

${isempty[;<string>...]}

Parameters

  • string (optional) - Zero or more strings to check

Behavior

  • Returns true if all arguments are empty strings
  • Returns true if no arguments provided
  • Returns false if any argument has content
  • Empty string means zero length

Examples

Check if empty:

${if;${isempty;${value}};value-empty;value-has-content}

Check multiple values:

${isempty;;;;}
# Returns: true (all empty)

Validate required fields:

${if;${isempty;${name};${email}};missing-fields;fields-ok}

No arguments:

${isempty}
# Returns: true

Use Cases

  • Input validation
  • Checking for missing values
  • Required field validation
  • Conditional logic on emptiness
  • Form validation

Notes

  • All arguments must be empty for true
  • Empty string is “”
  • Whitespace is not empty
  • Returns boolean
  • See also: ${length} to check string size
  • See also: ${def} for default values

See test cases in MacroTestsForDocsExamples.java