I have a function that reverses a string. I would like the function to return "Null" when a number is entered however when i input a number my function stops working. Is there something i am missing?
function reverseWords(words) {
let eachLetter = words.split("");
let reverseLetter = eachLetter.reverse();
let combineLetter = reverseLetter.join("");
if (typeof words !== "string") {
return null;
} else {
return combineLetter;
}
}
console.log(reverseWords(89));the operations you try to perform before the if are not possible with numbers.
Put validation as the first thing your function does and everything will work.
function reverseWords(words) {
if (typeof words !== "string") {
return null;
} else {
//Split the string
let eachLetter = words.split("");
let reverseLetter = eachLetter.reverse();
let combineLetter = reverseLetter.join("");
return combineLetter;
}
}
console.log(reverseWords('89'));
You cannot apply 'split' method on numbers. First, check for the numeric value and perform the split function only when it is a string.