Turns the symbol into a simple proc, which is especially useful for enumerations. Examples:

# The same as people.collect { |p| p.name }
people.collect(&:name)

# The same as people.select { |p| p.manager? }.collect { |p| p.salary }
people.select(&:manager?).collect(&:salary)

Source Code

# File active_support/core_ext/symbol.rb, line 10
def to_proc
  Proc.new { |*args| args.shift.__send__(self, *args) }
end