A simple example would be mixing map/reduce stuff on arrays with other non-built-in utility functions that take arrays without having to break the logical flow.

For a very simple example, manipulating and summing an array of values:

    import { range, sum } from 'ramda';

    range(0, 6)
      |> x => x.map(i => i * i)
      |> sum

Compare to:

    import { range, sum } from 'ramda';

    sum(
      range(0, 6)
        .map(i => i * i)
    )

...and then add three or four other non-builtin methods in between map steps and consider the resulting readability.