Mutations - trying to understand ( .toLowerCase() )

JavaScript
1

When I try to convert the entire argument to lower case, it doesn’t seem to convert?

Your code so far


function mutation(arr1) {
  
console.log(arr1);


arr1.toLowerCase();
  
  
  
console.log(arr1);


let fun = arr1.toLowerCase();
  

console.log(fun);
  
}

mutation(["heLLo", "hEy"]);

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/basic-algorithm-scripting/mutations

2

toLowerCase is a string method so only works on strings. arr1 is an array, not a string. You are trying to apply it to an array.

arr1 is an array of strings though. Try applying it to each element individually.