diff --git a/5.4ArrayMethod/t.js b/5.4ArrayMethod/t.js
index a0d43af..d3494c5 100644
--- a/5.4ArrayMethod/t.js
+++ b/5.4ArrayMethod/t.js
@@ -48,4 +48,32 @@ console.log(`arr.sort(): ${arr.sort(compare)}`);
 console.log(`arr.sort(): ${arr.sort((a,b) => a - b)}`);
 
 let countries = ['Österreich', 'Andorra', 'Vietnam'];
-console.log(countries.sort((a,b) => a.localeCompare(b)))
\ No newline at end of file
+console.log(countries.sort((a,b) => a.localeCompare(b)))
+
+// arr.reverse()
+countries = countries.reverse()
+console.log(countries)
+
+// arr.split() and arr.join()
+let names = "Bilbo, Gandalf, Nazgul";
+
+let nameLists = names.split(', ');
+
+for(let name of nameLists){
+    console.log(`A message to ${name}`);
+}
+// [LOG - 6/16/24 21:32:14] "A message to Bilbo"
+// [LOG - 6/16/24 21:32:14] "A message to Gandalf"
+// [LOG - 6/16/24 21:32:14] "A message to Nazgul"
+
+nameLists = names.split(', ', 2);
+for(let name of nameLists){
+    console.log(`A message to ${name}`);
+}
+// [LOG - 6/16/24 21:32:14] "A message to Bilbo"
+// [LOG - 6/16/24 21:32:14] "A message to Gandalf"
+
+console.log(`nameLists: ${nameLists.join('; ')}`)
+// [LOG - 6/16/24 21:33:45] "nameLists: Bilbo; Gandalf"
+
+