From f4ade90f40bb7961e794d20131362727bb923859 Mon Sep 17 00:00:00 2001
From: Anna Matveev <anna.matveev@gmail.com>
Date: Fri, 19 Jan 2018 12:58:51 +0200
Subject: [PATCH] Update oneAway.js

A shorter solution to this problem
---
 chapter01/1.5 - OneAway/oneAway.js | 79 ++++++------------------------
 1 file changed, 15 insertions(+), 64 deletions(-)

diff --git a/chapter01/1.5 - OneAway/oneAway.js b/chapter01/1.5 - OneAway/oneAway.js
index 1e66a89..effab34 100644
--- a/chapter01/1.5 - OneAway/oneAway.js	
+++ b/chapter01/1.5 - OneAway/oneAway.js	
@@ -1,64 +1,15 @@
-var oneAway = function(string1, string2) {
-  // insert a char for str1 -> remove a char for str2
-  var checkOneMissing = function(first, second) {
-    if (first.length !== second.length - 1) {
-      return false;
-    } else {
-      var mulligan = false;
-      var fP = 0; // first Pointer
-      var sP = 0; // second Pointer
-      while (fP < first.length) {
-        if (first[fP] !== second[sP]) {
-          if (mulligan) {
-            return false;
-          } else {
-            mulligan = true;
-            sP++; // second length is longer
-          }
-        } else {
-          fP++;
-          sP++;
-        }
-      }
-      return true;
-    }
-  };
-
-  var checkOneDiff = function(first, second) {
-    if (first.length !== second.length) {
-      return false;
-    } else {
-      var mulligan = false;
-      var fP = 0; // first Pointer
-      var sP = 0; // second Pointer
-      while (fP < first.length) {
-        if (first[fP] !== second[sP]) {
-          if (mulligan) {
-            return false; // more than one mismatch
-          } else {
-            mulligan = true; // use up mulligan
-          }
-        }
-        fP++;
-        sP++;
-      }
-      return true;
-    }
-  };
-  // insert a char for str1 -> remove a char for str2
-  // check one diff
-
-  // console log checks
-  // console.log(string1, string2, 'checkMiss', checkOneMissing(string1, string2));
-  // console.log(string2, string1, 'checkMiss', checkOneMissing(string2, string1));
-  // console.log(string1, string2, 'checkDiff', checkOneDiff(string1, string2));
-
-  return checkOneMissing(string1, string2) || checkOneMissing(string2, string1) || checkOneDiff(string1, string2);
-};
-
-
-// Test
-console.log(oneAway('pale', 'ple'), true);
-console.log(oneAway('pales', 'pale'), true);
-console.log(oneAway('pale', 'bale'), true);
-console.log(oneAway('pale', 'bake'), false);
\ No newline at end of file
+function oneAway(str1, str2) {
+	let arr1 = str1.split('');
+	let arr2 = str2.split('');
+	let diff = 0, p1 = 0, p2 = 0;
+	
+	while (p1 < arr1.length && p2 < arr2.length && diff <= 1) {
+		let isEqual = arr1[p1] === arr2[p2];
+		p1 +=  isEqual || arr1.length >= arr2.length;
+		p2 += isEqual  || arr2.length >= arr1.length;
+		diff += !isEqual;
+	}
+	
+	return diff <= 1;
+
+}