Using lodash to check whether an array has duplicate values

Question

What do you all think would be the best (best can be interpreted as most readable or most performant, your choice) way to write a function using the lodash utilities in orde

Answer 1

I don't know lodash but I submit:

_.any(_.countBy(['foo', 'foo', 'bar']), function(x){ return x > 1; });

The problem with all the solutions proposed so far is that the entire input array needs processing to get an answer, even if the answer is obvious from the first 2 elements of the array.