instance method

Set#include?

(A) -> bool

include?(item) → true or false

static VALUE
set_i_include(VALUE set, VALUE item)
{
    return RBOOL(RSET_IS_MEMBER(set, item));
}

Returns true if the set contains the given object:

Example

Set[1, 2, 3].include? 2   #=> true
Set[1, 2, 3].include? 4   #=> false

Note that include? and member? do not test member equality using == as do other Enumerables.

This is aliased to ===, so it is usable in case expressions:

Example

case :apple
when Set[:potato, :carrot]
  "vegetable"
when Set[:apple, :banana]
  "fruit"
end
# => "fruit"