Need a simple explanation of the inject method

Question

[1, 2, 3, 4].inject(0) { |result, element| result + element } # => 10

I\'m looking at this code but my brain is not registering how the number 1

Answer 1

The number you put inside your () of inject represents a starting place, it could be 0 or 1000. Inside the pipes you have two place holders |x, y|. x = what ever number you had inside the .inject('x'), and the secound represents each iteration of your object.

[1, 2, 3, 4].inject(5) { |result, element| result + element } # => 15

1 + 5 = 6 2 + 6 = 8 3 + 8 = 11 11 + 4 = 15