add: 最高频率的IP

src/array/highest-frequency-ip.js

@@ -0,0 +1,19 @@
+/**
+ * @param ipLines: ip  address
+ * @return: return highestFrequency ip address
+ */
+export const highestFrequency = function (ipLines) {
+  const map = new Map()
+  let max = 0
+  let maxN = ipLines[0]
+  ipLines.forEach(n => {
+    const temp = (map.get(n) || 0) + 1
+    map.set(n, temp)
+    if (temp > max) {
+      maxN = n
+      max = temp
+    }
+  })
+
+  return maxN
+}