leetcode/algorithms/FirstBadVersion/solution.py at master · P-ppc/leetcode · GitHub

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/**
 * Definition for isBadVersion()
 *
 * @param {integer} version number
 * @return {boolean} whether the version is bad
 * isBadVersion = function(version) {
 *     ...
 * };
 */

/**
 * @param {function} isBadVersion()
 * @return {function}
 */
var solution = function(isBadVersion) {
    /**
     * @param {integer} n Total versions
     * @return {integer} The first bad version
     */
    return function(n) {
        let start = 1,
            end = n

        while (start < end) {
            let index = parseInt((start + end) / 2)
            if (isBadVersion(index)) {
                end = index
            } else {
                start = index + 1
            }
        }

        return start
    };
};