[Enhance] Add Another Inject-Like Method That Might Occur in Ruby for Beginners

[berniechiu]

Objective

Since some Ruby beginners still write aggregations without inject, it's good to show them a benchmark on different usage that might occur to them.

Feature

• Updated ruby version with new benchmark
• Fix the changed file name

[berniechiu]

Wonder why some of the approved PRs not merging lol ~

[ixti]

There are at least 2 more ways of doing the same:

arr.sum # available as of Ruby 2.4
arr.inject(:+)

Also when you do summing you better pass initial memo:

arr = []

arr.sum # => 0
arr.inject(:+) # => nil
arr.inject(0, :+) # => 0
arr.inject(&:+) # => nil
arr.inject(0, &:+) # => 0

[ixti]

TBH IMO all that part should be completely rewritten. There's no point to refer rubies 1.x - they are EOL long time ago.

[FunkyloverOne]

OMG, 30x+ difference :o