Create 2325-decode-the-message.js

Author: everthis

2325-decode-the-message.js

@@ -0,0 +1,31 @@
+/**
+ * @param {string} key
+ * @param {string} message
+ * @return {string}
+ */
+var decodeMessage = function(key, message) {
+  const set =  new Set()
+  for(const ch of key) {
+    if(ch !== ' ') set.add(ch)
+    if(set.size === 26) break
+  }
+  const arr = Array.from(set).map((e, i) => [e, i])
+  const hash = {}
+  for(const [e, i] of arr) {
+    hash[e] = i
+  }
+  // console.log(arr)
+  const a = 'a'.charCodeAt(0)
+  let res = ''
+  for(const ch of message) {
+    if(ch === ' ') {
+      res += ' '
+      continue
+    }
+    const idx = hash[ch]
+    const tmp = String.fromCharCode(a + idx)
+    res += tmp
+  }
+  
+  return res
+};