From 240c499daa0965f4731135e25d33719d25c608e6 Mon Sep 17 00:00:00 2001
From: Christian Pilegaard Cederquist <christian.cederquist@gmail.com>
Date: Thu, 22 May 2025 22:47:13 +0200
Subject: [PATCH] Improve performance of getMatchRankings by replacing 4 string
 comparisons with a single indexOf

---
 src/index.ts | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/index.ts b/src/index.ts
index 7972c0e..317ac3f 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -196,23 +196,26 @@ function getMatchRanking<ItemType>(
   testString = testString.toLowerCase()
   stringToRank = stringToRank.toLowerCase()
 
+  // Use indexOf to check for equality/includes
+  const indexOfStringToRankInTestString = testString.indexOf(stringToRank)
+
   // case insensitive equals
-  if (testString === stringToRank) {
+  if (testString.length === stringToRank.length && indexOfStringToRankInTestString === 0) {
     return rankings.EQUAL
   }
 
   // starts with
-  if (testString.startsWith(stringToRank)) {
+  if (indexOfStringToRankInTestString === 0) {
     return rankings.STARTS_WITH
   }
 
   // word starts with
-  if (testString.includes(` ${stringToRank}`)) {
+  if (indexOfStringToRankInTestString > 0 && testString[indexOfStringToRankInTestString-1] === ' ') {
     return rankings.WORD_STARTS_WITH
   }
 
   // contains
-  if (testString.includes(stringToRank)) {
+  if (indexOfStringToRankInTestString > 0) {
     return rankings.CONTAINS
   } else if (stringToRank.length === 1) {
     // If the only character in the given stringToRank