Reversing a string and testing for a palindrome

This lesson covers reversing a string and testing for a palindrome in Julia, with the aim of understanding the basics of string handling.

reverse() reverses a string. A string that reads the same forwards and backwards is a palindrome.

In the sample code, an is_palindrome() function written in expression form compares the original with the reversed string in the single line s == reverse(s). "racecar" reads the same reversed, so it is judged a palindrome.

A common early stumble is how easily reverse() handles a string on its own. Many languages need you to convert to an array of characters first, and Julia's simplicity stands out here.

Reversal and palindrome checks rarely come up directly in practice, but they are a classic subject for practising how strings are handled.

📖 Reference code

function is_palindrome(s)
    s == reverse(s)
end

println(is_palindrome("racecar"))
println(is_palindrome("hello"))

✍️ Your code

Type your code, then press "Run"

🧪 This site can't compile or run Julia directly, so it checks on the spot whether what you typed matches the reference code (scoring happens entirely in your browser — nothing is sent anywhere).