acylam questions

acylam answers

• Extract all characters to the left of a list of possible characters
• Subsetting data by multiple values in multiple variables in R
• Tokenizing sentences with unnest_tokens(), ignoring abbreviations
• pad missing dates in a dataframe with several columns
• dplyr mutate using character vector of column names
• Using group_by() from dplyr with predict.lm and do() in a pipe for year linear extrapolation
• concatenate quosures and string
• Reshape values from 1 column and attach to existing column name
• Get latest record but if the latest is empty then get the last latest record
• Avoiding writing a long if-else statement in R