Ruby syntax : Who can explain this code easily?

Question

The inject method is so compact and efficient but very difficult. Can someone explain this code in a plain language or step by step?

The code :
a = (1..3).inject([0,0]){|sum,i| [sum[0]+i, sum[1]+i**2]}
print a
# Output : Yes you're right Baptiste, the output is [6, 14]. and Can you explain how the result is derived?

You're excellent!!!
I just understood your explanation.
And the code works well.

Answer 1

it does this (in detail)
sum=[0,0]
for i in (1..3) do
sum[0]+=i
sum[1]+=i**2
end

(there might be syntax error, I am not really good in ruby :) )

Answer 2

the output is not 20 but [6,14]

edited : I switched 6 and 4 ^^'

Answer 3

Yes @Lord Kirshna, I switched 6 and 4 by mistake, sorry ^^

Answer 4

To. Baptiste E. Prunier
Your code works well.
The explanation using for loop is easy to understand.
Thanks.

Answer 5

@Aris Kim my pleasure :)