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This post is kept (literally) minimal to demonstrate how simple is this hack using R (of course could be simple in other languages too). This is also to establish a point that R has got use-cases beyond statistics and data-mining.
Objective
rstats subreddit is one of the popular sources of R-related information / discussion on the internet. We’re trying to extract the top posts of rstats subreddit.
Data Format
Lucky for us, Reddit offers a json file for every subreddit (also post) and we’ll use that here.
subreddit url: "https://www.reddit.com/r/rstats/" subreddit json: "https://www.reddit.com/r/rstats/.json"
jsonlite @ Action
The package that will help us in this endeavor is jsonlite (by Jeroen Ooms and Team) for parsing json files and feeds. It’s got a sweet function that fromJSON() that parses a json file and stores the result in a list object. Ultimately, we can find the required information – title, url of the subreddit in there.
library(jsonlite)
reddit <- fromJSON("https://www.reddit.com/r/rstats/.json")
(top10 <- reddit$data$children$data[1:10,c("title","url")])
## title
## 1 Beginners Cookbook for Interactive Visualization in R with highcharter
## 2 Chaos game animation
## 3 Knitting an R Notebook to pdf- how do you wrap r code so it doesn't overflow across the page?
## 4 Taking a basic college stat class that does a lot of its work in R this fall... what would be a good way to learn/prepare myself going in with no experience?
## 5 Dealing with February heatmap, and 2 value heatmaps
## 6 Logging into your Rstudio Environment from Any Browser: Amazing
## 7 Creating a figure showing ratios on a line?
## 8 Using expressions in cowplot plot_grid labels?
## 9 help needed with r -integration package with SPSS
## 10 Significance test in R
## url
## 1 https://www.programmingwithr.com/beginners-cookbook-for-interactive-visualization-in-r-with-highcharter/
## 2 https://www.reddit.com/r/rstats/comments/cn4ym1/chaos_game_animation/
## 3 https://www.reddit.com/r/rstats/comments/cn6pok/knitting_an_r_notebook_to_pdf_how_do_you_wrap_r/
## 4 https://www.reddit.com/r/rstats/comments/cmuy42/taking_a_basic_college_stat_class_that_does_a_lot/
## 5 https://www.reddit.com/r/rstats/comments/cmylmk/dealing_with_february_heatmap_and_2_value_heatmaps/
## 6 https://jagg19.github.io/2019/08/aws-r/
## 7 https://www.reddit.com/r/rstats/comments/cmsqkr/creating_a_figure_showing_ratios_on_a_line/
## 8 https://www.reddit.com/r/rstats/comments/cmsvc0/using_expressions_in_cowplot_plot_grid_labels/
## 9 https://www.reddit.com/r/rstats/comments/cmtruo/help_needed_with_r_integration_package_with_spss/
## 10 https://www.reddit.com/r/rstats/comments/cmx3v0/significance_test_in_r/
3-lines
- Load the library
- Retrieve and Parse the json file
- Extract the relevant information for the list object
Summary
This post while is primarily intended to demonstrate the simplicity of R and jsonlite for json parsing, it can also be used to automate such a script to email or send notification about top 10 rstats subreddit post at a scheduled interval.
References
Read more
Beginners Cookbook for Interactive Visualization in R with highcharter
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