How can you generate an infinite string, then determine the number of occurrences of a specific character within the first N characters of that infinite string, using JavaScript?

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One way to generate an infinite string is to use a while loop to repeatedly concatenate a string with itself. For example:

let infiniteString = "abc";
while (true) {
  infiniteString += infiniteString;
}

This will create an infinite string of "abcabcabcabc..."

To determine the number of occurrences of a specific character within the first N characters, we can use the substring method to extract the first N characters of the infinite string, and then use a loop to count the number of occurrences of the desired character. For example, to count the number of occurrences of "a" within the first 100 characters:

let N = 100;
let count = 0;
let substring = infiniteString.substring(0, N);

for (let i = 0; i < substring.length; i++) {
  if (substring.charAt(i) === "a") {
    count++;
  }
}

console.log(count); // outputs the number of occurrences of "a"