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Change boolean expression #51

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Change boolean expression #51

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2 changes: 1 addition & 1 deletion programs.rmd
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Expand Up @@ -444,7 +444,7 @@ all(symbols == symbols[1])
As your vocabulary of R functions broadens, you'll think of more ways to do basic tasks. One method that I like for checking three of a kind is:

```r
length(unique(symbols) == 1)
length(unique(symbols)) == 1
```

The `unique` function returns every unique term that appears in a vector. If your `symbols` vector contains three of a kind (i.e., one unique term that appears three times), then `unique(symbols)` will return a vector of length `1`.
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