sum code snippets in ruby

explain this `fibonacci.sum {| number | number * number }` in ruby

explain what "sum" does here and what is &: ` def self.value(colors) colors.first(2).sum('', &color_rules).to_i end` in ruby

find the average of a list of numbers in ruby

find the average of all nodes in a linked list in ruby

find the sum of a list of numbers in ruby

find the sum of all elements in an array in ruby

find the sum of all keys in a map in ruby

find the sum of all nodes in a linked list in ruby

find the sum of all values in a map in ruby

here sum all fibonacci terms that are even: `def fibona(n) return n if n < 2 fib_sequence = [1, 1] (1...n).each do |_| fib_sequence << fib_sequence[-1] + fib_sequence[-2] end fib_sequence end` in ruby

how do i add these two element-wise so the result is another 3-element array? [*1..3] + [*4..6] in ruby

how to sum this if the hash is inside an array? [{ a: 5, b: 10, c: 15 }] in ruby

how to sum values found in a hash? in ruby