Write Arrow Functions with Parameters No Function

JavaScript
1

Why is this giving me a correct answer? The function has no ‘function.’

Your code so far


const myConcat = (arr1, arr2) => 

// test your code
console.log(myConcat([1, 2], [3, 4, 5]));

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/es6/write-arrow-functions-with-parameters

2

In real life this doesn’t work and returns undefined. Maybe there is a bug in the challenge unit test.