diff --git a/pop/pop.js b/pop/pop.js
new file mode 100644
index 0000000..0939fe0
--- /dev/null
+++ b/pop/pop.js
@@ -0,0 +1,4 @@
+let myHobby = ["play game","Harimau","read book"];
+
+myHobby.pop();
+console.log(myHobby)
\ No newline at end of file
diff --git a/pop/study-case.js b/pop/study-case.js
new file mode 100644
index 0000000..9ada348
--- /dev/null
+++ b/pop/study-case.js
@@ -0,0 +1,6 @@
+let animal = ["Singa", "Harimau", "Macan tutul"];
+function deleteLastIndex() {
+    return animal.pop();
+}
+deleteLastIndex();
+console.log(animal);
diff --git a/shift/shift.js b/shift/shift.js
new file mode 100644
index 0000000..982e0fd
--- /dev/null
+++ b/shift/shift.js
@@ -0,0 +1,4 @@
+let myHobby = ['game','Fishing',"Read Book"];
+
+myHobby.shift();
+console.log(myHobby);
\ No newline at end of file
diff --git a/shift/study-case.js b/shift/study-case.js
new file mode 100644
index 0000000..711d044
--- /dev/null
+++ b/shift/study-case.js
@@ -0,0 +1,7 @@
+let MyHobby = ["Running", "Hiking", "swimming"];
+
+function deleteMyHobby() {
+    return MyHobby.shift();
+}
+deleteMyHobby();
+console.log(MyHobby)
\ No newline at end of file
diff --git a/splice/splice.js b/splice/splice.js
new file mode 100644
index 0000000..81b1f9e
--- /dev/null
+++ b/splice/splice.js
@@ -0,0 +1,5 @@
+let animal = ['Kucing','Sapi','Kambing'];
+
+animal.splice(2,1);
+animal.splice(0,0,"ikan pitek");
+console.log(animal);
diff --git a/splice/study-case.js b/splice/study-case.js
new file mode 100644
index 0000000..9e6ec25
--- /dev/null
+++ b/splice/study-case.js
@@ -0,0 +1,9 @@
+let animal = ["Singa","Harimau","Macan Tutul"];
+
+function deleteElement(index, totalElement) {
+    return animal.splice(index,totalElement);
+}
+
+deleteElement(1, 1);
+console.log(animal);
+
diff --git a/unShift/study-case.js b/unShift/study-case.js
new file mode 100644
index 0000000..5760119
--- /dev/null
+++ b/unShift/study-case.js
@@ -0,0 +1,7 @@
+let animal = ["Bebek", "Ayam", "Mentok", "Harimau"];
+
+function AddAnimal() {
+    return animal.unshift("Jerapah", "Gajah");
+}
+AddAnimal();
+console.log(animal);
\ No newline at end of file
diff --git a/unShift/unShift.js b/unShift/unShift.js
new file mode 100644
index 0000000..c0836ba
--- /dev/null
+++ b/unShift/unShift.js
@@ -0,0 +1,4 @@
+let animal = ["Sapi", "kerbau", "Buaya", "Harimau"];
+animal.unshift("Kelinci", "Zebra");
+
+console.log(animal);
\ No newline at end of file