1 files changed, 23 insertions, 0 deletions
diff --git a/challenge-012/zapwai/javascript/ch-2.js b/challenge-012/zapwai/javascript/ch-2.js
new file mode 100644
index 0000000000..fecd56d950
--- /dev/null
+++ b/challenge-012/zapwai/javascript/ch-2.js
@@ -0,0 +1,23 @@
+let input = `/a/b/c/d
+/a/b/cd
+/a/b/cc
+/a/b/c/d/e`;
+
+function proc(input) {
+    let line = input.split("\n");
+    let prefix = line[0];
+    let cnt = 1;
+    while (cnt > 0) {
+        cnt = 0;
+        prefix = prefix.slice(0,prefix.lastIndexOf("/"));
+        for (let i = 0; i < line.length; i++) {
+	    let pattern = new RegExp("^"+prefix+"/");
+            if (!pattern.test(line[i])) {
+		cnt++;
+	    }
+	}
+    }
+    return prefix;
+}
+
+console.log(proc(input))