Ruby Add a pointer in a lambda to point to current lambda.
e.g. named this pointer as this.
def fibonacci
memo = [0, 1]
->(n) { memo[n] ||= this.call(n-1) + this.call(n-2) }
end
fibonacci.call(100) # => 354224848179261915075
instead of:
def fibonacci
memo = [0, 1]
feb = ->(n) { memo[n] ||= feb.call(n-1) + feb.call(n-2) }
feb
end
fib.call(100) # => 354224848179261915075
