Nodejs Utililty Methods Array Search Binary

function binaryIndexOf(searchElement) {
    'use strict';
    var minIndex = 0;
    var maxIndex = this.length - 1;
    var currentIndex = -1;
    var currentElement;
    while (minIndex <= maxIndex) {
        currentIndex = (minIndex + maxIndex) / 2 | 0;
        currentElement = this[currentIndex];
...

Array.prototype.binarySearch = function binarySearch(val, from, to){
    if (from === undefined) {
        from = 0;
    if (to === undefined) {
        to = this.length-1;
    var mid = Math.ceil((from+to)/2),
        midVal = this[mid];
...

Array.prototype.binary_search = function(val, left, right) {
    if (typeof left === 'undefined') left = 0;
    if (typeof right === 'undefined') right = this.length - 1;
    if (left > right) return null;
    var mid = (left + right) >> 1;
    if (val == this[mid]) {
        return mid;
    } else if (val > this[mid]) {
        return this.binary_search(val, mid + 1, right);
...

Array.prototype.binarysearch = function (i) {
    var l = 0, u = this.length,  m;
    while ( l <= u ) {
        m = ((l+u) >> 1);
        if ( i > this[m].i ) {
            l = m+1;
        } else {
            u = (i == this[m]) ? -2 : m - 1;
    return (u == -2) ? m : -1;
};

Array.prototype.bsearch = function (target) {
  var half = parseInt(this.length / 2);
  if (target === this[half]) {
    return half;
  if (target > this[half]) {
    return half + this.slice(half,this.length).bsearch(target);
  } else {
    return this.slice(0, half).bsearch(target);
...