add: 最长公共前缀

src/string/longest-common-prefix.js

@@ -0,0 +1,27 @@
+const comp = (left, right, res) => {
+  if (left.length > right.length) {
+    [left, right] = [right, left]
+  }
+
+  res = res || left
+  while (right.indexOf(res) !== 0 && res.length > 0) {
+    res = res.slice(0, res.length - 1)
+  }
+
+  return res
+}
+
+/**
+ * @param {string[]} strs
+ * @return {string}
+ */
+export const longestCommonPrefix = function (strs) {
+  if (strs.length < 2) return strs[0] || ''
+
+  let res = strs[0]
+  for (let i = 1; i < strs.length; i++) {
+    res = comp(res, strs[i])
+  }
+
+  return res
+}