在Javascript中将不同的字符串转换为大小写

您需要能够检测大写字母在另一个字母后面的字符串中的位置(即,不在空格后面)。你可以用正则表达式来实现, 你打电话来 toLowerCase 在输入字符串上:

\B(?=[A-Z])

换句话说,一个非单词边界,后跟一个大写字符。在上面或文本空间上拆分, 然后 .map

const snakeCase = string => {
    return string.replace(/\W+/g, " ")
      .split(/ |\B(?=[A-Z])/)
      .map(word => word.toLowerCase())
      .join('_');
};

console.log(snakeCase('snakeCase'));

Hello World? 您希望返回值为 hello_world?

const snakeCase = (string) => {
  return string.replace(/\d+/g, ' ')
    .split(/ |\B(?=[A-Z])/)
    .map((word) => word.toLowerCase())
    .join('_');
};

snakeCase('Hello World?')
// "hello_world?"

snakeCase('Hello & World')
// "hello_&_world"

我认为这个应该包括所有的基地

它的灵感来自@h0r53对公认答案的回答。然而,它演变成一个更完整的功能,因为它将转换 任何 camelCase kebab-case snake_case 就像你所期望的那样,只包含 a-z 和 0-9 字符,可用于函数名和变量名:

convert_to_snake_case(string) {
    return string.charAt(0).toLowerCase() + string.slice(1) // lowercase the first character
      .replace(/\W+/g, " ") // Remove all excess white space and replace & , . etc.
      .replace(/([a-z])([A-Z])([a-z])/g, "$1 $2$3") // Put a space at the position of a camelCase -> camel Case
      .split(/\B(?=[A-Z]{2,})/) // Now split the multi-uppercases customerID -> customer,ID
      .join(' ') // And join back with spaces.
      .split(' ') // Split all the spaces again, this time we're fully converted
      .join('_') // And finally snake_case things up
      .toLowerCase() // With a nice lower case
  }

转换示例:

'snakeCase'                  => 'snake_case'
'CustomerID'                 => 'customer_id'
'GPS'                        => 'gps'
'IP-address'                 => 'ip_address'
'Another & Another, one too' => 'another_another_one_too'
'random ----- Thing123'      => 'random_thing123'
'kebab-case-example'         => 'kebab_case_example'