[]=

        # Struct.[]=

(from ruby core)
---
    struct[name] = value -> value
    struct[n] = value -> value

---

Assigns a value to a member.

With symbol or string argument `name` given, assigns the given `value`
to the named member; returns `value`:

    Customer = Struct.new(:name, :address, :zip)
    joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
    joe[:zip] = 54321 # => 54321
    joe # => #<struct Customer name="Joe Smith", address="123 Maple, Anytown NC", zip=54321>

Raises NameError if `name` is not the name of a member.

With integer argument `n` given, assigns the given `value` to the `n`-th
member if `n` is in range; see [Array
Indexes](Array.html#class-Array-label-Array+Indexes):

    joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
    joe[2] = 54321           # => 54321
    joe[-3] = 'Joseph Smith' # => "Joseph Smith"
    joe # => #<struct Customer name="Joseph Smith", address="123 Maple, Anytown NC", zip=54321>

Raises IndexError if `n` is out of range.