diff --git "a/\354\210\230\354\232\224\354\235\274/MyungHwan/Week04/1.js" "b/\354\210\230\354\232\224\354\235\274/MyungHwan/Week04/1.js"
new file mode 100644
index 00000000..0291132b
--- /dev/null
+++ "b/\354\210\230\354\232\224\354\235\274/MyungHwan/Week04/1.js"
@@ -0,0 +1,8 @@
+function solution(absolutes, signs) {
+    let result = 0;
+    for(let i = 0; i < absolutes.length; i++){
+        if(signs[i] === false){
+            absolutes[i] = absolutes[i] * -1;
+        }result += absolutes[i]
+    }return result
+}
\ No newline at end of file
diff --git "a/\354\210\230\354\232\224\354\235\274/MyungHwan/Week04/2.js" "b/\354\210\230\354\232\224\354\235\274/MyungHwan/Week04/2.js"
new file mode 100644
index 00000000..ea1a4b52
--- /dev/null
+++ "b/\354\210\230\354\232\224\354\235\274/MyungHwan/Week04/2.js"
@@ -0,0 +1,9 @@
+function solution(numbers) {
+    let result = 0;
+    
+    for(let j = 0; j < 10; j++){
+        if(!numbers.includes(j)){
+            result = result + j
+        }
+    }return result
+}
\ No newline at end of file
diff --git "a/\354\210\230\354\232\224\354\235\274/MyungHwan/Week04/3.js" "b/\354\210\230\354\232\224\354\235\274/MyungHwan/Week04/3.js"
new file mode 100644
index 00000000..957c357b
--- /dev/null
+++ "b/\354\210\230\354\232\224\354\235\274/MyungHwan/Week04/3.js"
@@ -0,0 +1,7 @@
+function solution(s) {
+    let answer = s.length;
+    
+    if(answer % 2 === 0){
+        return s[(answer/2) - 1] + s[answer/2]
+    } return s[((answer + 1) / 2) - 1]
+}
\ No newline at end of file
diff --git "a/\354\210\230\354\232\224\354\235\274/MyungHwan/Week04/4.js" "b/\354\210\230\354\232\224\354\235\274/MyungHwan/Week04/4.js"
new file mode 100644
index 00000000..45679b36
--- /dev/null
+++ "b/\354\210\230\354\232\224\354\235\274/MyungHwan/Week04/4.js"
@@ -0,0 +1,4 @@
+function solution(n) {
+    let answer = '수박'.repeat(n/2)
+    return n % 2 === 0 ? answer : answer + '수';
+}
\ No newline at end of file
diff --git "a/\354\210\230\354\232\224\354\235\274/MyungHwan/Week04/5.js" "b/\354\210\230\354\232\224\354\235\274/MyungHwan/Week04/5.js"
new file mode 100644
index 00000000..055469c1
--- /dev/null
+++ "b/\354\210\230\354\232\224\354\235\274/MyungHwan/Week04/5.js"
@@ -0,0 +1,4 @@
+function solution(a, b) {
+    
+    return a.reduce((acc, cur, idx) => acc += a[idx] * b[idx], 0)
+}
\ No newline at end of file
diff --git "a/\354\210\230\354\232\224\354\235\274/MyungHwan/Week04/6.js" "b/\354\210\230\354\232\224\354\235\274/MyungHwan/Week04/6.js"
new file mode 100644
index 00000000..8275d701
--- /dev/null
+++ "b/\354\210\230\354\232\224\354\235\274/MyungHwan/Week04/6.js"
@@ -0,0 +1,3 @@
+function solution(s) {
+    return s.split("").sort().reverse().join("");
+}