The difference starts to show when you want to partially apply some values.

    // process1 :: (Item -> Bool) -> [Item] -> [OtherType]
    // process2 :: [Item] -> [OtherType]
    process1(isOk, items); //=> [otherType1, otherType2, ...]
    process2(items); //=> [otherType1, otherType2, ...]

    
    var processR1 = seq(filter, map(toOtherType), flatten);
    var processR2 = processR1(isOk);

    
    var processT1 = (isOk, items) => items.filter(isOk).map(toOtherType).flatten()
    var processT2 = items => processT1(isOk, items)

That's why I'm wondering if there's some easier way to do this.

I believe you can use partial() from this post[1] to do something like this:

  var processT1 = (isOk, items) => items.filter(isOk).map(toOtherType).flatten();
  var processT2 = partial(processT1, isOk);

http://benalman.com/news/2012/09/partial-application-in-java...