Add JSArray class to iterate the value

Author: kateinoigakukun

Sources/JavaScriptKit/JSArray.swift

@@ -0,0 +1,41 @@
+
+public class JSArray {
+
+    static let classObject = JSObjectRef.global.Array.object!
+
+    static func isArray(_ object: JSObjectRef) -> Bool {
+        classObject.isArray.function!(object).boolean!
+    }
+
+    let ref: JSObjectRef
+
+    public init?(_ ref: JSObjectRef) {
+        guard Self.isArray(ref) else { return nil }
+        self.ref = ref
+    }
+}
+
+
+extension JSArray: Sequence {
+    public typealias Element = JSValue
+
+    public func makeIterator() -> Iterator {
+        Iterator(ref: ref)
+    }
+
+    public class Iterator: IteratorProtocol {
+        let ref: JSObjectRef
+        var index = 0
+        init(ref: JSObjectRef) {
+            self.ref = ref
+        }
+        public func next() -> Element? {
+            defer { index += 1 }
+            guard index < ref.length.number! else {
+                return nil
+            }
+            let value = ref.get(index)
+            return value.isNull ? nil : value
+        }
+    }
+}

Sources/JavaScriptKit/JSValue.swift

@@ -34,6 +34,9 @@ public enum JSValue: Equatable {
         default: return nil
         }
     }
+    public var array: JSArray? {
+        object.flatMap { JSArray($0) }
+    }
     public var isNull: Bool { return self == .null }
     public var isUndefined: Bool { return self == .undefined }
     public var function: JSFunctionRef? {