morseCodeReplacements.js

function morseCodeReplacements(morseCode) {
    let result = [];
    let newStr = "";
    for (let i = 0; i < morseCode.length; i++) {
      let current = morseCode[i];
      let next = morseCode[i + 1];
      if (current === "." && next === ".") {
        newStr = morseCode
          .slice(0, i)
          .concat("--")
          .concat(morseCode.slice(i + 2));
        result.push(newStr);
      }
    }
    return result;
  }