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.