In the code above, the function appendAndDelete() takes three arguments: a string s, a string t, and a number k. It divides s into pieces using the split() function, and does the same for t. Then, it calculates the number of characters in each string, and stores that number in count. The function then loops through sArr and tArr, comparing each character in s to t. If they're the same, count++ is executed. The function then loops through sMinusCount and tMinusCount, subtracting sMinusCount from tMinusCount, and storing that value in STK. If tMinusCount + sMinusCount <= k, the function returns "Yes"; otherwise, it returns "No".
function appendAndDelete(s, t, k) {
let sArr = s.split("")
let tArr = t.split("")
let count = 0
for (let i = 0; i === count && i < s.length; i++) {
if (sArr[i] === tArr[i]) {
count++
}
}
let tMinusCount = t.length - count
let sMinusCount = s.length - count
let STK = k - (tMinusCount + sMinusCount)
if (tMinusCount + sMinusCount < k && t.length + s.length > k && STK % 2 !== 0) {
return "No"
} else if (tMinusCount + sMinusCount <= k) {
return "Yes"
} else {
return "No"
}
}