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Check Flat Case

// checkFlatCase method checks if the given string is in flatcase or not. Flatcase is a convention
// where all letters are in lowercase, and there are no spaces between words.
// thisvariable is an example of flatcase. In camelCase it would be thisVariable, snake_case this_variable and so on.

// Problem Source & Explanation:

 * checkFlatCase method returns true if the string in flatcase, else return the false.
 * @param {string} varname the name of the variable to check.
 * @returns {boolean} return true if the string is in flatcase, else return false.
const checkFlatCase = (varname) => {
  // firstly, check that input is a string or not.
  if (typeof varname !== 'string') {
    throw new TypeError('Argument is not a string.')

  const pat = /^[a-z]*$/
  return pat.test(varname)

export { checkFlatCase }