diff --git a/src/util/util/FieldError.ts b/src/util/util/FieldError.ts
index 810a9971..3bab92e7 100644
--- a/src/util/util/FieldError.ts
+++ b/src/util/util/FieldError.ts
@@ -23,7 +23,7 @@ export function FieldErrors(
 	return new FieldError(
 		50035,
 		"Invalid Form Body",
-		(fields as Object).map(({ message, code }) => ({
+		fields.map(({ message, code }) => ({
 			_errors: [
 				{
 					message,
diff --git a/src/util/util/extensions/Array.ts b/src/util/util/extensions/Array.ts
index d4b383ce..611a8437 100644
--- a/src/util/util/extensions/Array.ts
+++ b/src/util/util/extensions/Array.ts
@@ -27,6 +27,8 @@ declare global {
 		last(): T | undefined;
 		distinct(): T[];
 		distinctBy<K>(key: (elem: T) => K): T[];
+		intersect(other: T[]): T[];
+		except(other: T[]): T[];
 	}
 }
 
@@ -85,6 +87,14 @@ export function arrayDistinctBy<T, K>(this: T[], key: (elem: T) => K): T[] {
 	});
 }
 
+export function arrayIntersect<T>(this: T[], other: T[]): T[] {
+	return this.filter((value) => other.includes(value));
+}
+
+export function arrayExcept<T>(this: T[], other: T[]): T[] {
+	return this.filter((value) => !other.includes(value));
+}
+
 // register extensions
 if (!Array.prototype.containsAll)
 	Array.prototype.containsAll = function <T>(this: T[], target: T[]) {
@@ -121,4 +131,12 @@ if (!Array.prototype.distinct)
 if (!Array.prototype.distinctBy)
 	Array.prototype.distinctBy = function <T, K>(this: T[], key: (elem: T) => K) {
 		return arrayDistinctBy.call(this, key as ((elem: unknown) => unknown));
+	};
+if (!Array.prototype.intersect)
+	Array.prototype.intersect = function <T>(this: T[], other: T[]) {
+		return arrayIntersect.call(this, other);
+	};
+if (!Array.prototype.except)
+	Array.prototype.except = function <T>(this: T[], other: T[]) {
+		return arrayExcept.call(this, other);
 	};
\ No newline at end of file
diff --git a/src/util/util/extensions/Object.ts b/src/util/util/extensions/Object.ts
new file mode 100644
index 00000000..46da5965
--- /dev/null
+++ b/src/util/util/extensions/Object.ts
@@ -0,0 +1,29 @@
+declare global {
+	interface Object {
+		forEach(callback: (value: any, key: string, object: any) => void): void;
+		map<T>(callback: (value: any, key: string, object: any) => T): T[];
+	}
+}
+
+export function objectForEach(obj: any, callback: (value: any, key: string, object: any) => void): void {
+	Object.keys(obj).forEach((key) => {
+		callback(obj[key], key, obj);
+	});
+}
+
+export function objectMap<T>(obj: any, callback: (value: any, key: string, object: any) => T): T[] {
+	return Object.keys(obj).map((key) => {
+		return callback(obj[key], key, obj);
+	});
+}
+
+if (!Object.prototype.forEach)
+	Object.defineProperty(Object.prototype, "forEach", {
+		value: objectForEach,
+		enumerable: false,
+	});
+if (!Object.prototype.map)
+	Object.defineProperty(Object.prototype, "map", {
+		value: objectMap,
+		enumerable: false,
+	});
\ No newline at end of file
diff --git a/src/util/util/extensions/index.ts b/src/util/util/extensions/index.ts
index 540c47dd..3bde4f7f 100644
--- a/src/util/util/extensions/index.ts
+++ b/src/util/util/extensions/index.ts
@@ -1,3 +1,4 @@
 export * from "./Array";
 export * from "./Math";
 export * from "./Url";
+export * from "./Object";
\ No newline at end of file
diff --git a/src/util/util/lambert-server/check.ts b/src/util/util/lambert-server/check.ts
index efd8d20f..4dabc5ce 100644
--- a/src/util/util/lambert-server/check.ts
+++ b/src/util/util/lambert-server/check.ts
@@ -98,7 +98,7 @@ export function instanceOf(
 		}
 		if (typeof value !== "object") throw `${path} must be a object`;
 
-		const diff = Object.keys(value).missing(
+		const diff = Object.keys(value).except(
 			Object.keys(type).map((x) => (x.startsWith(OPTIONAL_PREFIX) ? x.slice(OPTIONAL_PREFIX.length) : x))
 		);