PeriodicLazyCoordinates created by hillal20 - https://repl.it/@hillal20/PeriodicLazyCoordinates

MyBinaryST.js

let a = [1,8,4,5,9]


function bs(l,h,arr,key){
  let sArr = arr.sort((a,b)=>{
    return a > b
  })
  

 let  middle = Math.floor((l+h+1/2))


 if( l === h ){
    if (sArr[l] === key){
      return true
    }
    
 }
 else {
   
     if (sArr[middle]=== key){
       return true
     }
     else if (key < sArr[middle]){
           return bs(l, middle-1,sArr,key)
     }
     else if (key > sArr[middle]){
       return bs(middle + 1, h ,sArr,key)
     }
    return false
 }


}
console.log(bs(0,a.length-1,a,8))