Julia has a for loop for iterating over a collection or repeating some code a certain number of times. You can use a while loop when the repetition depends on a condition, and you can influence the execution of both loops through break and continue.
We already encountered the for loop when iterating over the element e of a collection coll (refer to the Strings, Ranges 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
end
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
print(n^3)
end (This code can be a one-liner, but is spread over three lines...