Create 1694-reformat-phone-number.js

Author: everthis

1694-reformat-phone-number.js

@@ -0,0 +1,29 @@
+/**
+ * @param {string} number
+ * @return {string}
+ */
+const reformatNumber = function(number) {
+  let str = number.replace(/\-/g, '')
+  str = str.split(' ').join('')
+  const n = str.length
+  const re = n % 3
+  let lo = 0, hi = 0
+  let tmp = []
+  if(re === 1) {
+    hi = n - 5
+    tmp.push(str.slice(n - 4, n - 2), str.slice(n - 2))
+  } else if(re === 2) {
+    hi = n - 3
+    tmp.push(str.slice(n - 2))
+  } else {
+    hi = n - 1
+  }
+  const res = []
+  for(let i = lo; i <= hi; i += 3) {
+    res.push(str.slice(i, i + 3))
+  }
+  
+ res.push(...tmp)
+    
+  return res.join('-')
+};