[leet] zigzag conversion (mid)

Author: hyeonbinHur

허현빈/8주차/Zigzag Conversion.js

@@ -0,0 +1,30 @@
+/**
+ * @param {string} s
+ * @param {number} numRows
+ * @return {string}
+ */
+var convert = function(s, numRows) {
+    const arr = Array.from({ length: numRows }, () => [])
+
+    let idx = 0;
+    let flag = true
+    for(let i = 0 ; i < s.length ; i++){
+        arr[idx].push(s[i])
+        if(flag === true) {idx++}
+        else {idx--}
+
+        if(idx >= numRows){
+            flag = false
+            idx -= 2
+            if(idx < 0) idx = 0
+        }
+        if(idx === 0){
+            flag = true
+        }
+    }
+    let ans = ""
+    for(let i = 0 ; i < numRows; i++){
+        ans += arr[i].join("")
+    }
+    return ans 
+};