End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Struct#size

struct.size → integer

VALUE
rb_struct_size(VALUE s)
{
    return LONG2FIX(RSTRUCT_LEN(s));
}

Returns the number of struct members.

Example

Customer = Struct.new(:name, :address, :zip)
joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
joe.length   #=> 3

See also #select #to_a #members #to_h also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1