lunr.idf = function()

in miredot/lib/lunr/js/lunr.js [138:149]

• 9 lines of code
• 3 McCabe index (conditional complexity)

lunr.idf = function (posting, documentCount) {
  var documentsWithTerm = 0

  for (var fieldName in posting) {
    if (fieldName == '_index') continue // Ignore the term index, its not a field
    documentsWithTerm += Object.keys(posting[fieldName]).length
  }

  var x = (documentCount - documentsWithTerm + 0.5) / (documentsWithTerm + 0.5)

  return Math.log(1 + Math.abs(x))
}