diff --git a/code_study/Baekjoon/js/10988.js b/code_study/Baekjoon/js/10988.js
new file mode 100644
index 0000000..d39df78
--- /dev/null
+++ b/code_study/Baekjoon/js/10988.js
@@ -0,0 +1,9 @@
+const s = require("fs").readFileSync(0, "utf8").toString().trim();
+let flag = 1;
+for(let i=0; i<s.length/2; i++){
+    if(s[i]!=s[s.length-i-1]){
+        flag = 0;
+        break;
+    }
+}
+console.log(flag);
\ No newline at end of file
diff --git a/code_study/Baekjoon/js/1157.js b/code_study/Baekjoon/js/1157.js
new file mode 100644
index 0000000..a87a947
--- /dev/null
+++ b/code_study/Baekjoon/js/1157.js
@@ -0,0 +1,17 @@
+const n = require("fs").readFileSync(0,"utf8").toString().toUpperCase();
+let arr = new Array(26).fill(0);
+
+for(let c of n){
+    arr[c.charCodeAt()-'A'.charCodeAt()]++;
+}
+
+let max_idx = 0, cnt = 0;
+
+for(let i=0; i<26; i++){
+    if(arr[i]==Math.max(...arr)){
+        max_idx=i;
+        cnt++;
+    }
+}
+
+console.log(cnt>1 ? '?' : String.fromCharCode('A'.charCodeAt()+max_idx));
diff --git a/code_study/Baekjoon/js/2444.js b/code_study/Baekjoon/js/2444.js
new file mode 100644
index 0000000..d37d06c
--- /dev/null
+++ b/code_study/Baekjoon/js/2444.js
@@ -0,0 +1,7 @@
+const n = Number(require("fs").readFileSync(0, "utf8").toString());
+for(let i=1; i<=n; i++){
+    console.log(' '.repeat(n-i) + '*'.repeat(2*i-1));
+}
+for(let i=n-1; i>0; i--){
+    console.log(' '.repeat(n-i) + '*'.repeat(2*i-1));
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/js/25083.js b/code_study/Baekjoon/js/25083.js
new file mode 100644
index 0000000..45cf1b7
--- /dev/null
+++ b/code_study/Baekjoon/js/25083.js
@@ -0,0 +1,3 @@
+console.log(
+  "         ,r'\"7\nr`-_   ,'  ,/\n \\. \". L_r'\n   `~\\/\n      |\n      |"
+);
\ No newline at end of file
diff --git a/code_study/Baekjoon/js/3003.js b/code_study/Baekjoon/js/3003.js
new file mode 100644
index 0000000..e09f41c
--- /dev/null
+++ b/code_study/Baekjoon/js/3003.js
@@ -0,0 +1,3 @@
+const n = require("fs").readFileSync(0,'utf8').toString().split(" ").map(Number);
+const arr = [1,1,2,2,2,8];
+console.log(...arr.map((v,i)=>v-n[i]));
\ No newline at end of file