29 lines
601 B
JavaScript
29 lines
601 B
JavaScript
|
"use strict";
|
||
|
|
|
||
|
|
var toPosInt = require("../../number/to-pos-integer")
|
||
|
|
, callable = require("../../object/valid-callable")
|
||
|
|
, value = require("../../object/valid-value")
|
||
|
|
|
||
|
|
, floor = Math.floor;
|
||
|
|
|
||
|
|
module.exports = function (compareFn) {
|
||
|
|
var length, low, high, middle;
|
||
|
|
|
||
|
|
value(this);
|
||
|
|
callable(compareFn);
|
||
|
|
|
||
|
|
length = toPosInt(this.length);
|
||
|
|
low = 0;
|
||
|
|
high = length - 1;
|
||
|
|
|
||
|
|
while (low <= high) {
|
||
|
|
middle = floor((low + high) / 2);
|
||
|
|
if (compareFn(this[middle]) < 0) high = middle - 1;
|
||
|
|
else low = middle + 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (high < 0) return 0;
|
||
|
|
if (high >= length) return length - 1;
|
||
|
|
return high;
|
||
|
|
};
|