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'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;
};
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