Search Insert Position
var searchInsert = function(nums, target) {
let l=0,r=nums.length-1;
while(l<=r){
let mid = ~~((l+r)/2);
if(nums[mid]===target)
return mid
if(nums[mid]<target)
l = mid+1
else
r= mid-1
}
return l
};
searchInsert([1,3,5,6],5)