```
function
boot.janet on line 819, column 1
(reduce f init ind)
Reduce, also know as fold-left in many languages, transforms an
indexed type (array, tuple) with a function to produce a value by
applying f to each element in order. f is a function of 2 arguments,
(f accum el), where accum is the initial value and el is the next
value in the indexed type ind. f returns a value that will be used as
accum in the next call to f. reduce returns the value of the final
call to f.
```

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```
(reduce (fn [s1 s2]
(string "[" s1 "+" s2 "]"))
"x"
["a" "b" "c"])
#=> "[[[x+a]+b]+c]"
```