Pętle for

Julia średnio zaawansowana

Anthony Markham

Quantitative Developer

Plan kursu

for variable in iterable
    expression
end

shopping_list = ["Apples", "Bread", "Carrots", "Strawberries"]

println(shopping_list)

["Apples", "Bread", "Carrots", "Strawberries"]

Dostęp do każdego elementu struktury przez indeksowanie jest nieporęczny i niepraktyczny.

println(shopping_list[1])
println(shopping_list[2])
println(shopping_list[3])
println(shopping_list[4])

for item in shopping_list
    println(item)
end

Apples
Bread
Carrots
Strawberries

for item in shopping_list
    println(item)
    # first iteration, item = 'Apples'
end

Apples

for item in shopping_list
    println(item)
    # second iteration, item = 'Bread'
end

Apples
Bread

for item in shopping_list
    println(item)
    # third iteration, item = 'Carrots'
end

Apples
Bread
Carrots

for item in shopping_list
    println(item)
    # fourth iteration, item = 'Strawberries'
end

Apples
Bread
Carrots
Strawberries

Funkcja enumerate zwraca parę indeks–wartość podczas iterowania po strukturze danych.

for (index, item) in enumerate(shopping_list)
    println(index, " ", item)
end

1Apples
2Bread
3Carrots
4Strawberries

shopping_list = ["Apples", "Bread", "Carrots", "Strawberries"]

Julia średnio zaawansowana