pvdz/LICENSE.txt

## annotated.js
function(
   A, //The Set array
   B //The Subset array to check
) {
for(
 var // (redeclaration of A and B is ignored so is ok, else you'll lose extra bytes when moving their init out of the var decl)
   A=A.slice().sort(), //copy and sort set array
   B=B.slice().sort(), //copy and sort subset array
   a=A.length,
   b=B.length;
 a&&b;) //go until one array hits the end
   if(A[--a]==B[b-1])--b; // if element found from subset in set, inc subset index
 return !b //returns true if every subset element in B exists in A
}

## index.js
function(a,b){for(var a=a.slice().sort(),b=b.slice().sort(),c=a.length,d=b.length;c&&d;)if(a[--c]==b[d-1])--d;return!d}

## LICENSE.txt
            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2011 Max Irwin http://www.binarymax.com/

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. You just DO WHAT THE FUCK YOU WANT TO.

## package.json
{
  "name": "isSubset",
  "description": "Checks if array 'u' is subset of array 'S'.",
  "keywords": [
    "subset",
    "set"
  ]
}

## test.html
<!DOCTYPE html>
<title>Foo</title>
<div>Expected value: <b>true,false,true,true</b></div>
<div>Actual value: <b id="ret"></b></div>
<script>
  // write a small example that shows off the API for your example
  // and tests it in one fell swoop.

  var f = function(a,b){for(var a=a.slice().sort(),b=b.slice().sort(),c=a.length,d=b.length;c&&d;)if(a[--c]==b[d-1])--d;return!d}

	var a = ["apples","oranges","bananas","grapes","strawberries"];
	var b = ["strawberries","bananas"];
	var c = ["strawberries","kiwis"];
	var d = [];

	var r1 = f(a,b); // b is a subset of a

	var r2 = f(a,c); // c is not a subset of a

	var r3 = f(a,d); // The empty set is a subset

	var r4 = f(a,a); // A set is a subset of itself

	var r5 = f(a,e); // Just checking first and last element

  document.getElementById( "ret" ).innerHTML = r1 + ',' + r2 + ',' + r3 + ',' + r4 + ',' + r5;
</script>
	function(
	A, //The Set array
	B //The Subset array to check
	) {
	for(
	var // (redeclaration of A and B is ignored so is ok, else you'll lose extra bytes when moving their init out of the var decl)
	A=A.slice().sort(), //copy and sort set array
	B=B.slice().sort(), //copy and sort subset array
	a=A.length,
	b=B.length;
	a&&b;) //go until one array hits the end
	if(A[--a]==B[b-1])--b; // if element found from subset in set, inc subset index
	return !b //returns true if every subset element in B exists in A
	}
	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	Version 2, December 2004

	Copyright (C) 2011 Max Irwin http://www.binarymax.com/

	Everyone is permitted to copy and distribute verbatim or modified
	copies of this license document, and changing it is allowed as long
	as the name is changed.

	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

	0. You just DO WHAT THE FUCK YOU WANT TO.
	{
	"name": "isSubset",
	"description": "Checks if array 'u' is subset of array 'S'.",
	"keywords": [
	"subset",
	"set"
	]
	}
	<!DOCTYPE html>
	<title>Foo</title>
	<div>Expected value: <b>true,false,true,true</b></div>
	<div>Actual value: <b id="ret"></b></div>
	<script>
	// write a small example that shows off the API for your example
	// and tests it in one fell swoop.

	var f = function(a,b){for(var a=a.slice().sort(),b=b.slice().sort(),c=a.length,d=b.length;c&&d;)if(a[--c]==b[d-1])--d;return!d}

	var a = ["apples","oranges","bananas","grapes","strawberries"];
	var b = ["strawberries","bananas"];
	var c = ["strawberries","kiwis"];
	var d = [];

	var r1 = f(a,b); // b is a subset of a

	var r2 = f(a,c); // c is not a subset of a

	var r3 = f(a,d); // The empty set is a subset

	var r4 = f(a,a); // A set is a subset of itself

	var r5 = f(a,e); // Just checking first and last element

	document.getElementById( "ret" ).innerHTML = r1 + ',' + r2 + ',' + r3 + ',' + r4 + ',' + r5;
	</script>