Add method pop

Author: AndriiKot

app4.js

@@ -0,0 +1,9 @@
+const arr = ['str1','str2',2,1,11]
+
+console.log(arr.pop());          // 11
+console.log(arr);                // ['str1','str2',2,1,11]
+
+console.log(arr.unshift(55));    // 5
+console.log(arr);                // [55,'str1','str2',2,1,11]
+
+