https://dogcraft.net/wiki/index.php?action=history&feed=atom&title=Module%3AExponential_search 2026-04-11T12:15:16Z Revision history for this page on the wiki MediaWiki 1.39.2 https://dogcraft.net/wiki/index.php?title=Module:Exponential_search&diff=28275&oldid=prev 2022-12-15T04:54:08Z

<p>most recent version from wikipedia</p> <p><b>New page</b></p><div>-- This module provides a generic exponential search algorithm.<br /> <br /> local checkType = require('libraryUtil').checkType<br /> local floor = math.floor<br /> <br /> local function midPoint(lower, upper)<br /> return floor(lower + (upper - lower) / 2)<br /> end<br /> <br /> local function search(testFunc, i, lower, upper)<br /> if testFunc(i) then<br /> if i + 1 == upper then<br /> return i<br /> end<br /> lower = i<br /> if upper then<br /> i = midPoint(lower, upper)<br /> else<br /> i = i * 2<br /> end<br /> return search(testFunc, i, lower, upper)<br /> else<br /> upper = i<br /> i = midPoint(lower, upper)<br /> return search(testFunc, i, lower, upper)<br /> end<br /> end<br /> <br /> return function (testFunc, init)<br /> checkType('Exponential search', 1, testFunc, 'function')<br /> checkType('Exponential search', 2, init, 'number', true)<br /> if init and (init &lt; 1 or init ~= floor(init) or init == math.huge) then<br /> error(string.format(<br /> &quot;invalid init value '%s' detected in argument #2 to &quot; ..<br /> &quot;'Exponential search' (init value must be a positive integer)&quot;,<br /> tostring(init)<br /> ), 2)<br /> end<br /> init = init or 2<br /> if not testFunc(1) then<br /> return nil<br /> end<br /> return search(testFunc, init, 1, nil)<br /> end</div>

Domino