SERPs - Rating title by search term match

serps-compare-title-and-search-term

// stop words listed at end
// parse, then filter out empty ones.  Remove apostrphes both from stop words and search term

// Value based on if term exists and how close it is to the beginning, based on linear weight. 


var search_term = 'seo serp bookmarklet';
var serp_title = 'my seo serp bookmarklet for title value';
// remove stop words
search_term  = remove_stop_words(search_term);
serp_title   = remove_stop_words(serp_title);

// convert to arrays
search_term  = search_term.split(' ');
serp_title   = serp_title.split(' ');

// var serp_title = ['blog', 'post', 'title'];

var percentages = [];

var serch_term_length = search_term.length;
var title_length = serp_title.length; 

var i = 0;
var max = serch_term_length;

for(i=0;i<max;i++){
  // console.log(search_term[i]);
  // console.log(serp_title);
  if( ~serp_title.indexOf(search_term[i]) ){
    
    keyword_pos = serp_title.indexOf(search_term[i]);
    console.log(keyword_pos);
    percentages[i] = get_keyword_percentage(keyword_pos, i, title_length);
    percentages[i] = weight_percentage(percentages[i], 1);
    
  }else{
     percentages[i] = 0;
  }
  // console.log(percentages[i]);
}

console.log('sum = '+get_array_sum(percentages));
console.log('length = '+serch_term_length);

total_percent = get_array_sum(percentages)/serch_term_length;

console.log(total_percent);


function get_keyword_percentage(word_position, index, total_words){
   var percent = 1 - ( (word_position-index) / (total_words-index) );
  
   return percent; 
}

function weight_percentage(percent, weight){
  if(!percent){ return 0; }
  // this gives extra value to offset if word doesn't appear. If 1 + 50%. 
  var weighted_percent = ( percent + weight )/weight+1;
  return weighted_percent;
}

function get_array_sum(num_array){
  var sum = 0;
  var max = num_array.length;
  var i=0;
  for(i=0;i<max;i++){
    sum += num_array[i];
  }
  return sum;
}


function remove_stop_words(string){
  // check if array, if so remove from array instead
  
  return string;
}


// json.parse()
stop_words = '["A","","a","able","about","across","after","all","almost","also","am","ago ","among","an","and","ahead ","any","always ","are","as","at"," ","B",""," ","be","because","been","best","between ","but","before ","by","becomes "," ","C",""," ","can","cannot","could","could\'nt"," "," ","D",""," ","dear","did","done","don\'t ","do","does","doing"," "," ","E",""," ","either","else","ever","every","each","elsewhere "," ","F",""," ","for","from","further","forward "," ","G",""," ","get","got","go","gone","goes","going "," ","H",""," ","had","hadn\'t ","has","have","haven\'t ","he","her","hers","him","his","how","hence ","however"," ","I",""," ","i","if","in","inc ","into","itself ","is","i\'m ","it","ie","i\'ll","inward ","its"," ","J",""," ","just "," ","L",""," ","like","likely","let","let\'s","likewise"," ","M",""," ","may","me","might","most","must","makes","make ","my","mainly","maybe "," ","N",""," ","neither","no","now ","nor","not","near","needs"," "," ","O",""," ","of","off","often","on","over ","oh ","only","overall ","or","other","our","own"," ","R",""," ","rather","regards","right","really"," "," ","S",""," ","said","say","self ","says","see ","she","should","selves ","seem ","since","so","seeming ","some"," ","T",""," ","than","that","the","their","thereby ","them","then","they\'d ","there","these","they","that\'s ","this","tis","to","they\'ll ","too","twas","think","thorough "," ","U",""," ","us","unless","unlike","up","upon"," "," ","W",""," ","wants","was","we","were","what","when","where","which","while","who","whom","will","we\'ll ","with","would","whose ","whenever "," ","Y",""," ","yet","you","your","yours"]';