markdown Ruby编程技巧

Posted 2021-05-05

## Start up IRB with a file loaded initially
* `irb -r ./your_file.rb`
---
### Negative and Positive Infinity in Ruby
```ruby
neg_inf = -1.0 / 0
pos_inf = 1.0 / 0
```
---
### Reverse Iteration (no .reverse, no while loop)
```ruby
10.downto(0) do|index|
  puts index
end

```