- fundamentals

glimpse() returns information about the data frame.

df %>%
  glimpse()

## Rows: 525,461
## Columns: 8
## $ Invoice       <chr> "489434", "489434", "489434", "489434", "489434", "48943…
## $ StockCode     <chr> "85048", "79323P", "79323W", "22041", "21232", "22064", …
## $ Description   <chr> "15CM CHRISTMAS GLASS BALL 20 LIGHTS", "PINK CHERRY LIGH…
## $ Quantity      <dbl> 12, 12, 12, 48, 24, 24, 24, 10, 12, 12, 24, 12, 10, 18, …
## $ InvoiceDate   <dttm> 2009-12-01 07:45:00, 2009-12-01 07:45:00, 2009-12-01 07…
## $ Price         <dbl> 6.95, 6.75, 6.75, 2.10, 1.25, 1.65, 1.25, 5.95, 2.55, 3.…
## $ `Customer ID` <dbl> 13085, 13085, 13085, 13085, 13085, 13085, 13085, 13085, …
## $ Country       <chr> "United Kingdom", "United Kingdom", "United Kingdom", "U…

After using it, we can pipe additional manipulations.

df %>%
  glimpse() %>%
  select(Invoice)

## Rows: 525,461
## Columns: 8
## $ Invoice       <chr> "489434", "489434", "489434", "489434", "489434", "48943…
## $ StockCode     <chr> "85048", "79323P", "79323W", "22041", "21232", "22064", …
## $ Description   <chr> "15CM CHRISTMAS GLASS BALL 20 LIGHTS", "PINK CHERRY LIGH…
## $ Quantity      <dbl> 12, 12, 12, 48, 24, 24, 24, 10, 12, 12, 24, 12, 10, 18, …
## $ InvoiceDate   <dttm> 2009-12-01 07:45:00, 2009-12-01 07:45:00, 2009-12-01 07…
## $ Price         <dbl> 6.95, 6.75, 6.75, 2.10, 1.25, 1.65, 1.25, 5.95, 2.55, 3.…
## $ `Customer ID` <dbl> 13085, 13085, 13085, 13085, 13085, 13085, 13085, 13085, …
## $ Country       <chr> "United Kingdom", "United Kingdom", "United Kingdom", "U…

## # A tibble: 525,461 × 1
##    Invoice
##    <chr>  
##  1 489434 
##  2 489434 
##  3 489434 
##  4 489434 
##  5 489434 
##  6 489434 
##  7 489434 
##  8 489434 
##  9 489435 
## 10 489435 
## # ℹ 525,451 more rows

- with group_by()

When used on a grouped data frame, it adds information on the grouping columns and the number of groups.

df %>%
  group_by(Country) %>%
  glimpse()

## Rows: 525,461
## Columns: 8
## Groups: Country [40]
## $ Invoice       <chr> "489434", "489434", "489434", "489434", "489434", "48943…
## $ StockCode     <chr> "85048", "79323P", "79323W", "22041", "21232", "22064", …
## $ Description   <chr> "15CM CHRISTMAS GLASS BALL 20 LIGHTS", "PINK CHERRY LIGH…
## $ Quantity      <dbl> 12, 12, 12, 48, 24, 24, 24, 10, 12, 12, 24, 12, 10, 18, …
## $ InvoiceDate   <dttm> 2009-12-01 07:45:00, 2009-12-01 07:45:00, 2009-12-01 07…
## $ Price         <dbl> 6.95, 6.75, 6.75, 2.10, 1.25, 1.65, 1.25, 5.95, 2.55, 3.…
## $ `Customer ID` <dbl> 13085, 13085, 13085, 13085, 13085, 13085, 13085, 13085, …
## $ Country       <chr> "United Kingdom", "United Kingdom", "United Kingdom", "U…