javascript - Composing a function from an uncurried function -


i'm trying create curriable function returns whether or not supplied length equal length of supplied string. i'd work this:

checklength(3)('asdf') // => false checklength(4)('asdf') // => true

i tried this, argument order reversed because returns curried equals function:

const checklength = r.compose(r.equals(), r.prop('length')) checklength('asdf')(4)

i can fix wrapping in function this:

const checklength = (len) => r.compose(r.equals(len), r.prop('length'))

but seems there way use functional library solve this. have ideas?

the simplest way go flip function found - unfortunately work properly, need add stage of uncurrying composed function:

const checklength = r.flip(r.uncurryn(2, r.compose(r.equals, r.prop('length')))) checklength(4)('asdf') // => true

an alternative solution use usewith function:

const checklength = r.usewith(r.equals, [r.identity, r.prop('length')]); checklength(4)('asdf') // => true

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