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Update mapping-with-an-index.md

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Steven Degutis
2016-02-09 17:37:55 -06:00
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clojure/mapping-with-an-index.md
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@@ -9,3 +9,10 @@ can reach for `map-indexed`. The `map-indexed` function can be used like so:
> (map-indexed (fn [idx item] (str idx " - " item)) foods) > (map-indexed (fn [idx item] (str idx " - " item)) foods)
("0 - pizza" "1 - hotdog" "2 - chicken alfredo") ("0 - pizza" "1 - hotdog" "2 - chicken alfredo")
``` ```
Alternatively, `map` can take multiple sequences, and each becomes a new argument to the mapping function. By giving an infinite sequential list of numbers starting at 0 as the first sequence, you can pretend they're indices, like so:
```clojure
> (map (fn [idx item] (str idx " - " item)) (range) foods)
("0 - pizza" "1 - hotdog" "2 - chicken alfredo")
```