diff --git a/01week/datatypes.js b/01week/datatypes.js
index e69de29bb..4d284791b 100644
--- a/01week/datatypes.js
+++ b/01week/datatypes.js
@@ -0,0 +1,54 @@
+const day = date.getDay();
+const hour = date.getHours();
+const minute = date.getMinutes();
+console.log("today is " + [day] + " " + [hour] + ":" + [minute]);
+
+
+const number = (x) => {
+    console.log(toString(x));
+}
+number("84");
+
+
+const string = (number) => {
+    console.log(Number(number));
+}
+string(48);
+
+
+const type = (datatype) => {
+    console.log(typeof datatype);
+}
+type(false);
+
+
+const add = (x, y) => {
+    console.log (x + y);
+}
+add(4,6);
+
+
+const a = 6;
+const b = 9;
+const c = 12;
+
+function twoTrue() {
+    if (b>a && c>b) {
+        console.log(a+b);
+    }
+}
+twoTrue();
+
+const oneTrue = (x,y) => {
+    if (x>y || x==y) {
+        console.log(x+y);
+    }
+}
+oneTrue(3,1);
+
+const noneTrue = (x,y) => {
+    if (!x>y && !x==y) {
+        console.log(x+y);
+    }
+}
+noneTrue(1,3);
\ No newline at end of file