704. Binary Search

binary-search.js

/**
 * @param {number[]} nums
 * @param {number} target
 * @return {number}
 */
var search = function(nums, target) {
    let start = 0;
    let end = nums.length -1;

    while(start <= end) {
        let middle = Math.trunc((start + end) / 2);
        if(nums[middle] == target) 
            return middle;
        else if (nums[middle] < target)
            start = middle + 1;
        else
            end = middle - 1;
    }
    return -1;    
};