| category_to_id | Converts content category to YouTube id | 
| clean_top_videos | Cleans top vidoes data after scraping | 
| get_category_list | Gets list of YouTube content categories | 
| get_comments | Access the youtube API to get a list of comments from a... | 
| get_region_list | Gets list of YouTube content regions | 
| get_tidy_titles | Creates a list of cleaned list of YouTube video titles for... | 
| get_top_titles | Returns a list of 200 titles from the most popular YouTube... | 
| get_top_videos | Makes data frame of most currently popular YouTube videos | 
| graph_top_videos_category | Creates a bar graphs of the most currently popular YouTube... | 
| make_cloud | Create a word cloud from a list of comments. | 
| make_top_title_word_cloud | Creates and returns a word cloud of 200 of the titles on... | 
| pipe | Pipe operator | 
| region_to_id | Converts region to YouTube id | 
| titles_sentiment_contribution_bing | Generates a plot of top 10 words that contribute to positive... | 
| titles_sentiment_type_nrc | Generates a plot of the number of words that contribute to... | 
| valid_api_call | Determines if user is providing a valid API key | 
| valid_api_call_comment | Determine if user is providing a valid API key and video ID | 
| validate_category | Validates category inputted by user | 
| validate_region | Validates region inputted by user | 
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