add len(set) JME function

numbas · Jun 8, 2015 · 164cf33 · 164cf33
1 parent fa9c21f
commit 164cf33
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diff --git a/runtime/scripts/jme.js b/runtime/scripts/jme.js
@@ -2486,6 +2486,7 @@ newBuiltin('intersection',[TSet,TSet],TSet,setmath.intersection);
 newBuiltin('or',[TSet,TSet],TSet,setmath.union);
 newBuiltin('and',[TSet,TSet],TSet,setmath.intersection);
 newBuiltin('-',[TSet,TSet],TSet,setmath.minus);
+newBuiltin('abs',[TSet],TNum,setmath.size);
 
 newBuiltin('in',['?',TSet],TBool,null,{
 	evaluate: function(args,scope) {

diff --git a/runtime/scripts/math.js b/runtime/scripts/math.js
@@ -2064,6 +2064,14 @@ var setmath = Numbas.setmath = {
 	 */
 	minus: function(a,b) {
 		return a.filter(function(v){ return !setmath.contains(b,v); });
+	},
+
+	/** Size of a set
+	 * @param {set} set
+	 * @returns {number}
+	 */
+	size: function(set) {
+		return set.length;
 	}
 }