ruby - Why do you need to subtract from size of array? -

ruby - Why do you need to subtract from size of array? -

when seek run sec line without subtracting size of array, won't work. why not?

values = [10, 9, 11, 2, 45] max_element = values.size - 1 first = values[0] in 0..max_element while first < values[i] first = values[i] end end p "the largest value #{first}"

besides methods on enumerable or array such each, for iterator loops on collection of elements?

because array indices zero-based, in c or java:

values = [10, 9, 11, 2, 45] values.size #=> 5 values[0] #=> 10 (1st element) values[4] #=> 45 (last element) values[5] #=> nil (this beyond lastly item)

you can utilize ... (three dots) exclude range's end:

for in 0...values.size # ... end

furthermore, while should if:

if first < values[i] first = values[i] end # or first = values[i] if first < values[i]

ruby loops for-loop