Ni55aN/AssociationRule.js

## AssociationRule.js
 var AssociationRules = function(transactions, MIN_SUPPORT, MAX_COMBINATION) {

     var getOptions = function(data) {
         var set = new Set();
         data.map(function(el) {
             el.map(function(val) {
                 if (val != null)
                     set.add(val);
             });
         });
         return Array.from(set);
     }

     var arrayContains = function(arr, values) {
         return values.every(function(e) {
             return arr.includes(e);
         });
     }

     function arrayToCombinations(arr, size) {
         var result_set = [],
             result;

         for (var x = 0; x < Math.pow(2, arr.length); x++) {
             result = [];
             i = arr.length - 1;
             do {
                 if ((x & (1 << i)) !== 0)
                     result.push(arr[i]);
             } while (i--);

             if (result.length == size)
                 result_set.push(result);
         }
         return result_set;
     }

     function combinationsToArray(combinations) {
         var set = new Set();
         combinations.forEach(function(combination) {
             set = new Set([...set, ...combination]);
         });
         return Array.from(set);
     }


     var options = getOptions(transactions);
     var results = [];
     var acceptableResults = [];


     var targetOptions = options;
     var combinationsSize = 1;

     while (combinationsSize < MAX_COMBINATION) {

         var combinations = arrayToCombinations(targetOptions, combinationsSize);
         if (combinations.length == 0) break;

         var supports = new Array(combinations.length).fill(0);
         combinations.forEach(function(combination, i) {
             transactions.forEach(function(transaction) {
                 if (arrayContains(transaction, combination))
                     supports[i] += 1 / transactions.length;
             });
         });

         results.push([combinations, supports]);

         var acceptableCombinations = combinations.filter(function(comb, i) {
             return supports[i] >= MIN_SUPPORT;
         });
         supports = supports.filter(function(supp) {
             return supp >= MIN_SUPPORT;
         });

         if (acceptableCombinations.length == 0) break;

         acceptableResults.push([acceptableCombinations, supports]);

         targetOptions = combinationsToArray(acceptableCombinations);
         combinationsSize++;
     };

     return {
         all: results,
         acceptable: acceptableResults
     };
 }

## demo.html
<html>
   <head>
      <style>
         html {
         text-align: center;
         }
         body {
         margin: 40pt auto;
         max-width: 800pt;
         text-align: center;
         }
         table {
         border-collapse: collapse;
         margin: 2%;
         }
         td,
         th {
         padding: 6px 8px;
         border: 1px solid #444;
         }
      </style>
     <link rel="javascript" type="text/javascript" href="AssociationRule.js">
      <script>
         function printTable(arr, needTranspose, rowHeader) {

               if (needTranspose)
                   arr = arr[0].map(function(_, c) {
                       return arr.map(function(r) {
                           return r[c];
                       });
                   });

               var out = '<table>';
               arr.forEach(function(row, i) {
                   out += '<tr>' + (rowHeader ? '<th>' + rowHeader + '<sub>' + (i + 1) + '</sub></th>' : '');

                   row.forEach(function(el) {
                       out += '<td>' + el + '</td>';
                   });
                   out += '</tr>';
               });
               out += '</table>';

               document.body.innerHTML += out;
           }

         window.onload = function() {

               var transactions = [
                   ["Laptop","Mouse","Router"],
                   ["Monitor","System unit","Headphones"],
                   ["Mouse","Monitor","System unit","Loudspeakers","Mousepad","Keyboard"],
                   ["GPU","CPU","Keyboard"],
                   ["Laptop","Router","Headphones","Mousepad"],
                   ["Mouse","Monitor","System unit","Loudspeakers","Headphones","Mousepad","Keyboard"],
                   ["Router","Monitor","System unit","Mousepad","Keyboard"],
                   ["GPU","CPU"],
                   ["Laptop","Powerbank","Headphones"],
                   ["Mouse","Mousepad","Keyboard"],
                   ["Loudspeakers","Headphones"],
                   ["Router"]
               ];

               printTable(transactions, false, 'Транзакция');

               var rules = new AssociationRules(transactions, 0.3, 6);

               for (var i in rules.all)
                  printTable(rules.all[i], true);

               for (var i in rules.acceptable)
                   printTable(rules.acceptable[i], true);
           }
      </script>
   </head>
   <body>
   </body>
</html>
	var AssociationRules = function(transactions, MIN_SUPPORT, MAX_COMBINATION) {

	var getOptions = function(data) {
	var set = new Set();
	data.map(function(el) {
	el.map(function(val) {
	if (val != null)
	set.add(val);
	});
	});
	return Array.from(set);
	}

	var arrayContains = function(arr, values) {
	return values.every(function(e) {
	return arr.includes(e);
	});
	}

	function arrayToCombinations(arr, size) {
	var result_set = [],
	result;

	for (var x = 0; x < Math.pow(2, arr.length); x++) {
	result = [];
	i = arr.length - 1;
	do {
	if ((x & (1 << i)) !== 0)
	result.push(arr[i]);
	} while (i--);

	if (result.length == size)
	result_set.push(result);
	}
	return result_set;
	}

	function combinationsToArray(combinations) {
	var set = new Set();
	combinations.forEach(function(combination) {
	set = new Set([...set, ...combination]);
	});
	return Array.from(set);
	}


	var options = getOptions(transactions);
	var results = [];
	var acceptableResults = [];


	var targetOptions = options;
	var combinationsSize = 1;

	while (combinationsSize < MAX_COMBINATION) {

	var combinations = arrayToCombinations(targetOptions, combinationsSize);
	if (combinations.length == 0) break;

	var supports = new Array(combinations.length).fill(0);
	combinations.forEach(function(combination, i) {
	transactions.forEach(function(transaction) {
	if (arrayContains(transaction, combination))
	supports[i] += 1 / transactions.length;
	});
	});

	results.push([combinations, supports]);

	var acceptableCombinations = combinations.filter(function(comb, i) {
	return supports[i] >= MIN_SUPPORT;
	});
	supports = supports.filter(function(supp) {
	return supp >= MIN_SUPPORT;
	});

	if (acceptableCombinations.length == 0) break;

	acceptableResults.push([acceptableCombinations, supports]);

	targetOptions = combinationsToArray(acceptableCombinations);
	combinationsSize++;
	};

	return {
	all: results,
	acceptable: acceptableResults
	};
	}
	<html>
	<head>
	<style>
	html {
	text-align: center;
	}
	body {
	margin: 40pt auto;
	max-width: 800pt;
	text-align: center;
	}
	table {
	border-collapse: collapse;
	margin: 2%;
	}
	td,
	th {
	padding: 6px 8px;
	border: 1px solid #444;
	}
	</style>
	<link rel="javascript" type="text/javascript" href="AssociationRule.js">
	<script>
	function printTable(arr, needTranspose, rowHeader) {

	if (needTranspose)
	arr = arr[0].map(function(_, c) {
	return arr.map(function(r) {
	return r[c];
	});
	});

	var out = '<table>';
	arr.forEach(function(row, i) {
	out += '<tr>' + (rowHeader ? '<th>' + rowHeader + '<sub>' + (i + 1) + '</sub></th>' : '');

	row.forEach(function(el) {
	out += '<td>' + el + '</td>';
	});
	out += '</tr>';
	});
	out += '</table>';

	document.body.innerHTML += out;
	}

	window.onload = function() {

	var transactions = [
	["Laptop","Mouse","Router"],
	["Monitor","System unit","Headphones"],
	["Mouse","Monitor","System unit","Loudspeakers","Mousepad","Keyboard"],
	["GPU","CPU","Keyboard"],
	["Laptop","Router","Headphones","Mousepad"],
	["Mouse","Monitor","System unit","Loudspeakers","Headphones","Mousepad","Keyboard"],
	["Router","Monitor","System unit","Mousepad","Keyboard"],
	["GPU","CPU"],
	["Laptop","Powerbank","Headphones"],
	["Mouse","Mousepad","Keyboard"],
	["Loudspeakers","Headphones"],
	["Router"]
	];

	printTable(transactions, false, 'Транзакция');

	var rules = new AssociationRules(transactions, 0.3, 6);

	for (var i in rules.all)
	printTable(rules.all[i], true);

	for (var i in rules.acceptable)
	printTable(rules.acceptable[i], true);
	}
	</script>
	</head>
	<body>
	</body>
	</html>