The arrows that iterate through the steps is great UX. I'm new to both array and stack based programming and it was pretty intuitive. How would I go about file

The arrows that iterate through the steps is great UX. I'm new to both array and stack based programming and it was pretty intuitive. How would I go about file i/o and parsing json? I have a data processing benchmark[1] that I'd like to use this for. [1] : https://github.com/jinyus/related_post_gen https://github.com/jinyus/related_post_gen