Zepto Closest Implementation: https://github.com/madrobby/zepto/blob/master/src/zepto.js#L...
JQ.Mobi: https://github.com/appMobi/jQ.Mobi/blob/master/jq.mobi.js#L3...
Zepto End Implementation: https://github.com/madrobby/zepto/blob/master/src/zepto.js#L...
JQ.Mobi: https://github.com/appMobi/jQ.Mobi/blob/master/jq.mobi.js#L4...
That said, it's all open source and there are only so many ways to write these functions succinctly.