Julia's array comprehensions use the following syntax:
[expression for element = iterable]
Note that as with
for loops, all of
∈ are accepted for the comprehension.
This is roughly equivalent to creating an empty array and using a
for loop to
push! items to it.
result =  for element in iterable push!(result, expression) end
however, the type of an array comprehension is as narrow as possible, which is better for performance.
For example, to get an array of the squares of the integers from
10, the following code may be used.
squares = [x^2 for x=1:10]
This is a clean, concise replacement for the longer
squares =  for x in 1:10 push!(squares, x^2) end