SOURCE

function search(nums, target) {
    let num= Math.round(nums.length/2)

    // if(nums.lenght % 2 !=0){
    //     num =Math.round(num)+1
    // }
    if(nums[num]==target) return num 
    // if(nums[num+1]==target) return num+1
    if(target < nums[num]){
        return search(nums.slice(0,num),target)
    }
    if(target > nums[num]){
        return search(nums.slice(num+1),target)
    }
}
console.log(search([1,2,3,4], 2))