I don't know the difference between the forEach and the for - for-loop

Question

function solution(s) {
const str = s.split(" ");
return str
.map((ele) => {
let result = "";
for (let i = 0; i < ele.length; i++) {
if (i % 2 === 0) {
result += ele[i].toUpperCase();
} else {
result += ele[i].toLowerCase();
}
}
return result;
})
.join(" ");
// console.log(solution("try hello world"));
In this way, I can get a correct answer which is TrY HeLlO WoRlD.
However,
function solution(s) {
const str = s.split(" ");
return str.map((ele) => {
let result = "";
ele.split("").forEach((value, index) => {
if (index % 2 === 0) {
result += value.toUpperCase();
} else {
result += value.toLowerCase();
}
});
return result;
});
.join(" ");
}
In this way, I can't get a answer.
How should I correct the answer which is using forEach?
Correct answer is TrY HeLlO WoRlD.
**
I'm not good at writing English.
I ask for your understanding🙏🙏

Answer 1

Looks like your only issue was the semicolon that did not let you chain the .join.
function solution(s) {
const str = s.split(" ");
return str.map((ele) => {
let result = "";
ele.split("").forEach((value, index) => {
if (index % 2 === 0) {
result += value.toUpperCase();
} else {
result += value.toLowerCase();
}
});
return result;
}).join(" "); // no semicolon so you can chain the join
};