implement Japanese class

1 files changed, 14 insertions, 0 deletions

diff --git a/util/array.ts b/util/array.ts
index f032935..c5a26c6 100644
--- a/util/array.ts
+++ b/util/array.ts
@@ -1,3 +1,5 @@
+import "./set.ts";
+
 declare global {
 	interface Array<T> {
 		/** @summary check if any of the elements of `arr2` are included in `this` */
@@ -8,6 +10,10 @@ declare global {
 		set(): Set<T>;
 		/** @summary clear array */
 		clear(): void;
+		/** @summary filter duplicates from array */
+		filterDuplicates(): Array<T>;
+		/** @summary `true` if the array doesn't contain duplicate items */
+		isUniq(): boolean;
 	}
 }
 
@@ -27,3 +33,11 @@ Array.prototype.clear = function() {
 	while (this.length > 0) this.pop();
 }
 
+Array.prototype.filterDuplicates = function() {
+	return this.set().arr(); // TODO: optimize this
+}
+
+Array.prototype.isUniq = function() {
+	return this.length == this.filterDuplicates().length;
+}
+