Run results for: Substring Test

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36

Browser: Chrome 86

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Map- best	1081942.0 Ops/sec
Search- best	923711.4 Ops/sec
Includes -best	2039372.0 Ops/sec
Map - random	1111825.0 Ops/sec
Search- random	442079.8 Ops/sec
Includes- random	1803191.0 Ops/sec
Map -bad	57124.7 Ops/sec
Search-bad	2129.5 Ops/sec
Includes -bad	28832.8 Ops/sec

Script Preparation code:

function createString(length) {
   var result           = '';
   var characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
   var charactersLength = characters.length;
   for (let i = 0; i < length; i++ ) {
      result += characters.charAt(Math.floor(Math.random() * charactersLength));
   }
   return result;
}
let length = 500
var randomWord1 = createString(length)
var randomWord2 = createString(length)

var bestWord1 = 'a'
var bestWord2 = 'a'

var badWord1 = ('a'.repeat(length) + 'g')
var badWord2 = ('x'.repeat(length) + 'g')

function checkMap(string1, string2) {
  let seenMap = new Map()
  for(let letter of string1) {
    if(!seenMap.has(letter)) {
      if(string2.includes(letter)) return "YES"
      seenMap.set(letter, true)
    }
  }
  return "NO"
}
function checkSearch(string1,string2){
  for(let letter of string1){
    if(string2.search(string1.substring(letter))!=-1){
      return "YES";
    }
  }
  return "NO";
}
function checkIncludes(string1,string2){
  for(let letter of string1) {
    if(string2.includes(letter))return "YES";
  }
  return "NO";
}

Tests:

Map- best
checkMap(bestWord1, bestWord2)
Search- best
checkSearch(bestWord1, bestWord2)
Includes -best
checkIncludes(bestWord1, bestWord2)
Map - random
checkMap(randomWord1, randomWord1)
Search- random
checkSearch(randomWord1, randomWord1)
Includes- random
checkIncludes(randomWord1, randomWord1)
Map -bad
checkMap(badWord1, badWord2)
Search-bad
checkSearch(badWord1, badWord2)
Includes -bad
checkIncludes(badWord1, badWord2)

Run results for: Substring Test

Map- best

Search- best

Includes -best

Map - random

Search- random

Includes- random

Map -bad

Search-bad

Includes -bad