[Refactor] add SetDataSize

See tc39/proposal-set-methods#105

.eslintrc

@@ -14,6 +14,7 @@
 				"IteratorValue",
 				"RequireObjectCoercible",
 				"SetDataHas",
+				"SetDataSize",
 				"ToBoolean",
 
 				// GetSetRecord

aos/SetDataSize.js

@@ -0,0 +1,8 @@
+'use strict';
+
+var tools = require('es-set/tools');
+var $setSize = tools.size;
+
+module.exports = function SetDataSize(setData) {
+	return $setSize(setData);
+};

implementation.js

@@ -1,6 +1,6 @@
 'use strict';
 
-// Note: the commented out code is because there is no performant way in userland to do the optimization in step 7.
+// Note: the commented out code is because there is no performant way in userland to do the optimization in step 6.
 
 var $TypeError = require('es-errors/type');
 
@@ -12,6 +12,7 @@ var GetSetRecord = require('./aos/GetSetRecord');
 var IteratorStep = require('es-abstract/2023/IteratorStep');
 var IteratorValue = require('es-abstract/2023/IteratorValue');
 var SetDataHas = require('./aos/SetDataHas');
+var SetDataSize = require('./aos/SetDataSize');
 var ToBoolean = require('es-abstract/2023/ToBoolean');
 
 var forEach = require('es-abstract/helpers/forEach');
@@ -23,7 +24,6 @@ var isSet = require('is-set');
 var tools = require('es-set/tools');
 var $setForEach = tools.forEach;
 var $setAdd = tools.add;
-var $setSize = tools.size;
 
 var $push = callBound('Array.prototype.push');
 var $setHas = callBind($Set.prototype.has);
@@ -40,50 +40,49 @@ module.exports = function intersection(other) {
 
 	var resultSetData = []; // step 4
 
-	var thisSize = $setSize(O); // step 5
-
-	if (thisSize <= otherRec['[[Size]]']) { // step 6
-		var index = 0; // step 6.a
+	var thisSize = SetDataSize(O); // step 5.a
+	if (thisSize <= otherRec['[[Size]]']) { // step 5
+		var index = 0; // step 5.b
 		$setForEach(O, function (e) {
-			if (index < thisSize) { // step 6.b
-				index += 1; // step 6.b.ii
-				var inOther = ToBoolean(Call(otherRec['[[Has]]'], otherRec['[[Set]]'], [e])); // step 6.b.iii.1
-				if (inOther) { // step 6.b.iii.2
-					var alreadyInResult = SetDataHas(resultSetData, e); // step 6.b.iii.2.b
-					if (!alreadyInResult) { // step 6.b.iii.2.c
-						$push(resultSetData, e); // step 6.b.iii.c.i
+			if (index < thisSize) { // step 5.c
+				index += 1; // step 5.c.ii
+				var inOther = ToBoolean(Call(otherRec['[[Has]]'], otherRec['[[Set]]'], [e])); // step 5.c.iii.1
+				if (inOther) { // step 6.c.iii.2
+					var alreadyInResult = SetDataHas(resultSetData, e); // step 5.c.iii.2.b
+					if (!alreadyInResult) { // step 5.c.iii.2.c
+						$push(resultSetData, e); // step 5.c.iii.c.i
 						thisSize += 1;
 					}
 				}
 			}
 		});
-	} else { // step 7
-		var keysIter = GetIteratorFromMethod(otherRec['[[Set]]'], otherRec['[[Keys]]']); // step 7.a
-		var next = true; // step 7.b
-		while (next) { // step 7.c
-			next = IteratorStep(keysIter); // step 7.c.i
-			if (next) { // step 7.c.ii
-				var nextValue = IteratorValue(next); // step 7.c.ii.1
-
-				if (nextValue === 0) { // step 7.c.ii.2
+	} else { // step 6
+		var keysIter = GetIteratorFromMethod(otherRec['[[Set]]'], otherRec['[[Keys]]']); // step 6.a
+		var next = true; // step 6.b
+		while (next) { // step 6.c
+			next = IteratorStep(keysIter); // step 6.c.i
+			if (next) { // step 6.c.ii
+				var nextValue = IteratorValue(next); // step 6.c.ii.1
+
+				if (nextValue === 0) { // step 6.c.ii.2
 					nextValue = +0;
 				}
-				var alreadyInResult = SetDataHas(resultSetData, nextValue); // step 7.c.ii.4
-				var inThis = $setHas(O, nextValue); // step 7.c.ii.5
-				if (!alreadyInResult && inThis) { // step 7.c.ii.6
-					$push(resultSetData, nextValue); // step 7.c.ii.6.a
+				var alreadyInResult = SetDataHas(resultSetData, nextValue); // step 6.c.ii.4
+				var inThis = $setHas(O, nextValue); // step 6.c.ii.5
+				if (!alreadyInResult && inThis) { // step 6.c.ii.6
+					$push(resultSetData, nextValue); // step 6.c.ii.6.a
 				}
 			}
 		}
 	}
 
-	// var result = OrdinaryObjectCreate(%Set.prototype%, « [[SetData]] »); // step 8
+	// var result = OrdinaryObjectCreate(%Set.prototype%, « [[SetData]] »); // step 7
 	var result = new $Set();
 
-	// result.[[SetData]] = resultSetData; // step 9
+	// result.[[SetData]] = resultSetData; // step 8
 	forEach(resultSetData, function (e) {
 		$setAdd(result, e);
 	});
 
-	return result; // step 10
+	return result; // step 9
 };