Julia While Loop – Syntax and Examples

Julia While Loop

Julia while loop is used to iterate a set of statements over a collection of elements, like an array.

In this Julia Tutorial, we will learn how to write While Loop in Julia programs with examples.

Syntax – While Loop

The syntax of While loop in Julia is

while boolean_expression
    statement(s)
end

where while and end are keywords.

Example 1 – While Loop to count

In this example, we use a while loop to print the numbers from 1 to 4.

script.jl

n = 0
while n < 4
    n += 1
    println(n)
end

Output

1
2
3
4

Example 2 – Julia While Loop with String Array

In this example, we will use the while loop to greet all the guests, whose names are stored in a string array.

script.jl

guests = ["Ted", "Robyn", "Barney"]

i = 1
while i <= length(guests)
    friend = myfriends[i]
    println("Hi $friend, good to see you!")
    i += 1
end

Output

Hi Ted, good to see you!
Hi Robyn, good to see you!
Hi Barney, good to see you!

Example 3 – Julia While Loop to Find Factorial

In this example, we will use the while loop to find the factorial of a number.

script.jl

n = 0
result = 1
while n < 4
    n += 1
    result *= n
end
println(result)

Output

24

Conclusion

In this Julia Tutorial, we learned the syntax and usage of While Loop in Julia, with the help of example scripts.