const mapHelper = (arr) => {
return arr
.map((char, idx) => {
if (idx % 2 == 0) {
return char.toUpperCase();
}
return char.toLowerCase();
})
.join("");
};
const solution = (s) => {
return s
.split(" ")
.map((word) => word.split(""))
.map(mapHelper)
.join(" ");
};