user=> (reduce + [1 2 3 4 5]) 15 user=> (reduce + []) 0 user=> (reduce + 1 []) 1 user=> (reduce + 1 [2 3]) 6
user=> (reduce + [1 2 3 4 5]) 15 user=> (reduce + []) 0 user=> (reduce + 1 []) 1 user=> (reduce + 1 [2 3]) 6
user=> (reduce + [1 2 3 4 5]) 15 user=> (reduce + []) 0 user=> (reduce + 1 []) 1 user=> (reduce + 1 [2 3]) 6
user=> (reduce + []) 0 user=> (reduce + 1 []) 1 user=> (reduce + 1 [2 3]) 6