Glue numbers and characters in R

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# Glue numbers and characters in R
## Lecture background
### Sina Rüeger
### July 13, 2020

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# Learner persona description (1/2)

The learner persona I am addressing:

## Background
- works in the field of biology & medicine
- spends an increasing amount of time doing data analysis
- studied biology, hence not a statistician and not a computer scientist

## Experience
- uses R a few times per week, on average 2 hours per day
- knows RMarkdown
- used the function `paste` before
- has not seen `glue`

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# Learner persona description (2/2)

## Needs
- wants to move faster from raw data to reports
- thinks that some parts of previous reports could be recycled and used by others

## Special considerations

- works sometimes on high-performance computing clusters, hence installing glue might be a problem

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# Concept map

The mental model I intend to convey.

![](mental-model.png)

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# Requirements

```r
library(glue)
library(dplyr)
```

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# Formative assessment 1

Tweak the following R command so that it returns

`Yesterdays average temperature was 20.2 celsius.`

```r
metric <- "celsius"
temperature <- 20.2
glue("Yesterdays average temperature was [temperature] [metric].")
```

## Solution
Replace `[]` with `{}`, or set `.open = "["` and `.close = "]"`.

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# Formative assessment 2

Predict the output of the following R code and choose solution 1, 2, 3 or 4 below.

```r
trees <- c("pine", "fir", "cedar")
glue_collapse(trees, sep = ",", last = "and")
```

1. `pine, fir and cedar`
1. `pine,firandcedar`
1. `pine,fir,cedar`
1. `pine + fir + cedar`

## Solution
2, the R code creates `pine,firandcedar`.

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# Supporting Material

- RMarkdown file: [sinarueeger.github.io/glue-tutorial/glue](https://sinarueeger.github.io/glue-tutorial/glue)
- Lecture background [sinarueeger.github.io/glue-tutorial/slides/background#1](https://sinarueeger.github.io/glue-tutorial/slides/background#1)