> For the complete documentation index, see [llms.txt](https://calnix.gitbook.io/eth-dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://calnix.gitbook.io/eth-dev/gas-opt/x-and-and-y-or-or.md).

# X && Y, ||

### X && Y

* if X is false, it doesn't matter what Y is
* x > 2 && y > 3  -> if the first condition is false, the second will not get evaluated
* this is because the entire expression will evaluate to false
* Implication: put the cheaper condition first, so there is a possibility to skip the evaluation of the second 

### X || Y

* only one condition needs to be true
* put the cheaper condition to evaluate first


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