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
