js binary search recursion and while writing code sharing

This article mainly shares with you the js binary search recursion and while writing code, hoping to help everyone.

1. Recursion
Mainly controls three variables: start end mid, start end mid, repeat it and it will be ok.

const data = [18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1]function Recursive(s,data){

    let len = data.length
    let start = 0
    let end = len-1
    let mid
    return find(start,end,s)}function find(start,end,s){

       mid =Math.ceil((end+start)/2) 

        if (s==data[mid]) {            return s
        }         else if(s>data[mid] && start <= end) {

            end = mid-1
            return find(start,end,s)
        }        else if(s<data[mid] && start <= end){

         start  = mid+1

          return  find(start,end,s)

        }        else{            return null
        }

}
let v = f(15,data)
console.log("vvvv",v)

1. while loop

const data = [18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1]function while_find(s){
    let len = data.length
    let start = 0
    let end = len-1
    let mid

    while(start <= end){

        mid =Math.ceil((end+start)/2)

        if (s<data[mid]) {

            start = mid+1
        }        else if(s>data[mid]){            end = mid-1 
        }        else{            return s
        }


    }  return null}
let v= while_find(8)
console.log("vvvv",v)

Mainly draws on this article. Click to open it. There are also some variations of the binary algorithm. Interested students can Go check it out Great writing.

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