Julia：loops与map

for i in 1:5
    print(i, ", ")
end
#> 1, 2, 3, 4, 5,
# =与in作用相同
print("\n")
for i = 1:5
    print(i, ", ")
end
print("\n")

# array can also be looped over directly:
a1 = [1,2,3,4,5]
for i in a1
    print(i, ", ")
end
println()

# continue and break work in the same way as python
a2 = collect(1:20)
for i in a2
    if i%2 != 0
        continue
    end
    print(i, ", ")
    if i >= 8
        break
    end
end
println() #> 2, 4, 6, 8,

while !isempty(a1)
    print(pop!(a1), ", ")
end
println()
#> 5, 4, 3, 2, 1,

d1 = Dict(1=>"one", 2=>"two", 3=>"three")
# dicts may be looped through using the keys function:
for k in sort(collect(keys(d1)))
    print(k, ": ", d1[k], ", ")
end
println()

# enumerate can be used to get both the index and value in a loop
a3 = ["one", "two", "three", "four", "five"]
for (i, v) in enumerate(a3)
    print(i, ":, ", v, ", ")
end
println()
#> 1:, one, 2:, two, 3:, three, 4:, four, 5:, five,

# map works as you might expect performing the given function on each member of an array
a4 = map((x) -> x^2, [1, 2, 3, 4])
print(a4) # [1, 4, 9, 16]