编写一个函数，将单个camelcase格式的字符串转换为snake_case格式的字符串。

解决方案

// a function cameltocase that takes a string (text) as the parameter.
function cameltocase(text) {

  // transform each uppercase letter (character) based on its position.
  function uppertounderscorelower(character, position) {

    // if the letter isn't the first character, add an underscore and convert it to lowercase.
    return (position > 0 && "_") + match.tolowercase();
  }

  // replace all uppercase letters in (text) by calling the uppertounderscorelower function.
  return text.replace(/[a-z]/g, uppertounderscorelower);
}

console.log(cameltocase("cameltocase"));

结果

> camel_to_case

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