for loops

We already encountered the for loop when iterating over the element e of a collection coll (refer to the StringsRanges and Arrays sections in Chapter 2, Variables, Types, and Operations). This takes the following general form:

# code in Chapter 4\repetitions.jl 
for e in coll 
   # body: process(e) executed for every element e in coll 

Here, coll can be a range, a string, an array, or any other iterable collection (for other uses, also refer to Chapter 5, Collection Types). The variable e is not known outside the for loop. When iterating over a numeric range, often = (equal to) is used instead of in:

    for n = 1:10   

(This code can be a one-liner, but is spread over three lines for clarity.) The for loop is generally ...

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