What’s happening: I think my code is correct. I tested the function in the console and I can see the expected output.
I found this typo in the expected results (no closing parenthesis):
Might this be causing the error?
My code so far
function mutation(arr) {
let first = arr[0].toLowerCase();
for (letter in arr[1]) { //Iterate through the letters in the second string.
if (first.indexOf(arr[1][letter].toLowerCase()) === -1) {
return false; //For every letter, if it's not contained in the first string, return false.
}
}
return true; //Else, return true.
}
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Challenge: Mutations
Link to the challenge: