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Update Alathea_Expressions.md #57

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11 changes: 11 additions & 0 deletions 10_Expressions/Alathea_Expressions.md
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Expand Up @@ -82,6 +82,17 @@ concat(quote(f), a = 1, b = quote(mean(a)))
#> f(a = 1, b = mean(a))
```

Possible solution:

```r
concat <- function(what, a, b){
as.call(list(what, substitute({a = a_arg}, list(a_arg = a))[[2]], substitute({b = b_arg}, list(b_arg = b))[[2]]))
}

concat(quote(f), a = 1, b = quote(mean(a)))
```


### Since list()s don’t belong in expressions, we could create a more convenient call constructor that automatically combines lists into the arguments. Implement make_call() so that the following code works.


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