015 - String utils

class StringUtils {
  static toCamelCase(s: string): string {
    return s
      .toLowerCase()
      .replace(/[_-]/g, ' ')
      .replace(/\s(.)/g, ($1: string) => {
        return $1.toUpperCase();
      })
      .replace(/\s/g, '')
      .replace(/^(.)/, ($1: string) => {
        return $1.toLowerCase();
      });
  }

  static toKebabCase(s: string): string {
    return s
      .toLowerCase()
      .replace(/[\s_]+/g, '-')
      .replace(/\s(.)/g, ($1: string) => {
        return $1.toUpperCase();
      })
      .replace(/^(.)/, ($1: string) => {
        return $1.toLowerCase();
      });
  }

  static toSnakeCase(s: string): string {
    return s
      .toLowerCase()
      .replace(/[\s-]+/g, '_')
      .replace(/\s(.)/g, ($1: string) => {
        return $1.toUpperCase();
      })
      .replace(/^(.)/, ($1: string) => {
        return $1.toLowerCase();
      });
  }

  static toUpperSnakeCase(s: string): string {
    return this.toSnakeCase(s).toUpperCase();
  }
}

console.info(StringUtils.toCamelCase("abc DEF ghi"));
// Output abcDefGhi
console.info(StringUtils.toKebabCase("abc DEF ghi"));
// Output abc-def-ghi
console.info(StringUtils.toSnakeCase("abc DEF ghi"));
// Output abc_def_ghi
console.info(StringUtils.toUpperSnakeCase("abc DEF ghi"));
// Output ABC_DEF_GHI