Yesterday I came up with an idea for syntactic sugar for partial application, introducing two new operators: placeholder (`?`) and rest placeholder (`???`).
You can see the details in a proposal gist I made [1], but the gist of the gist is that you could do partial application like this: foo(1, ?, 2); or with the rest placeholder: foo(?, 1, ???); This allows for partial application at arbitrary argument indices. There's a cowpath to be paved here as well, lodash introduced placeholders for _.partial as of 3.0.0 [2], where you can do something similar: _.partial(foo, 1, _, 2); _.partial(foo, _, 1); However, the proposed syntax is even more flexible than that of lodash because it also allows you to have rest placeholders at arbitrary argument indices instead of at the end, e.g. foo(1, ???, 2); would have to be expressed with lodash as _.partialRight(_.partial(foo, 1), 2); WDYT? [1] https://gist.github.com/anonymous/5c4f6ea07ad3017d61be [2] https://lodash.com/docs#partial
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