all-string-methods/index.js

You will get all required string operations from this package

const isInputValid = inputStr => {
  if (inputStr && typeof inputStr === "string") {
    return true;
  }
  return false;
};

const toCharArray = inputStr => {
  if (isInputValid(inputStr)) {
    return inputStr.split("");
  }
  return "";
};

const equals = (inputStr1, inputStr2) => {
  if (isInputValid(inputStr1) && isInputValid(inputStr2)) {
    return inputStr1 === inputStr2;
  }
  return false;
};

const equalsIgnoreCase = (inputStr1, inputStr2) => {
  if (isInputValid(inputStr1) && isInputValid(inputStr2)) {
    return inputStr1.toLowerCase() === inputStr2.toLowerCase();
  }
  return false;
};

module.exports = {
  toCharArray: toCharArray,
  equals: equals,
  equalsIgnoreCase: equalsIgnoreCase
};