## How to get the most common class among elements

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How can I get the most common data type (i.e. class) among the elements of an array? For example, for this array:

```array = [nil, "string", 1, 3, 0.234, 25, "hot potato"]
```

`Integer` should be returned since it's the most common class.

```array.group_by(&:class).max_by{|k, v| v.length}.first
# => Integer
```

Find a most common class, who place similar elements in similar positions. elements, but they are not as useful for identifying relationships among elements that may have an unspecified This can be thought of as a search for “classes” or “types” of elements, much in​  Make use of Python Counter which returns count of each element in the list. Thus, we simply find the most common element by using most_common() method.

```array.each_with_object(Hash.new(0)) { |e,h| h[e.class] += 1 }.
max_by(&:last).
first
#=> Integer
```

the first step being

```array.each_with_object(Hash.new(0)) { |e,h| h[e.class] += 1 }
#=> {NilClass=>1, String=>2, Integer=>3, Float=>1}
```

Social Sequence Analysis: Methods and Applications, Make a set of the list so that the duplicate elements are deleted. Then find the highest count of occurrences of each element in the set and thus, we find the  most_common(n) Method Overview: most_common() returns a list of top 'n' elements from most common to least common, as specified the parameter 'n'. The list consists of tuples and each tuple contains the element and the element count . If the parameter 'n' is not specified or None is passed as the parameter most_common() returns a list of all

Following can also work,

```array.inject(Hash.new(0)) { |h,v| h[v.class] += 1; h }.max_by(&:last).first
```

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• This will call `count` for each element, thus traversing the array multiple times.
• If you are concerned with the speed, try with a much larger array (where the speed should actually matter in real life), for example `array * 100000`, and see what happens.
• @ray but it has a default value of `0` so `h[:z] = h[:z] + 1` becomes `h[:z] = 0 + 1` on the first invocation.
• You have to run each benchmark multiple times to get a meaningful result. Wrap each test in `50_000.times { ... }` and see what happens. (`inject` and `each_with_object` should be almost identical and `group_by` should be slightly faster)
• `'each_by_object'` should be `...max_by(&:last)`, not `...max_by()`. I suggest you add `require 'benchmark'`.