WIP: Initial implementation of optional lens #1
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Hey @baransu, time flies 😱 Sorry about that! What do you think about the following two ideas for optional operator: [%focus person |. department |. address |? street_number][%focus person -> department -> address -?> street_number]
[%focus person |. departments |* address |? street_number][%focus person -> departments -*> address -?> street_number]Appears to be valid syntax: https://astexplorer.net/#/gist/8b6189cbc0c84f3678bd45191b93989b/84db4f5e9143e06a62ac675c4c63c515ccf9e1c9 |
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The basic implementation working for simple cases 🙂
Currently,
friendStreetNumberlens compiles but returns an invalid result because we're not accepting enough nested field. With other types, it wouldn't compile.The optional operator is subject to change but
?is not a valid infix operator and PPX have to be valid Reason if we want to use the AST.