Nodejs String to Underscore toUnderscore()

Method Source Code

/**//from   www .j a  v a  2s.  co  m
 * This function returns an underscored version of the string.
 *
 * @method
 * @public
 *
 * @returns An underscored version of this string.
 */
String.prototype.toUnderscore = function() {
  var str = this;
  var modified = '';

  for (var i = 0; i < str.length; i++) {

    // If this character is lowercase, append it to the string.
    if (isLower(str[i])) {
      modified += str[i];

    // If this character is uppercase, continue processing.
    } else {

      // If there is a previous character, continue processing.
      if (str.length > i-1) {

        // If the previous character is lowercase, then we need to append an
        // underscore.
        if (isLower(str[i-1])) {
          modified += '_' + str[i].toLowerCase();
        } else {
          modified += str[i].toLowerCase();
        }

      // If there's no previous character, then just lowercase this one.
      } else {
        modified += str[i].toLowerCase();
      }
    }
  }

  return modified;
};

Related

1. toUnderscore()

   String.prototype.toUnderscore = function(){
     return this.charAt(0).toLowerCase() + this.substring(1).replace(/([A-Z])/g, function($1){return "_"+$1.toLowerCase();});
   };
   console.log(process.argv[2].toUnderscore());
   

2. toUnderscore()

   String.prototype.toUnderscore = function(){
     return this.replace(/([A-Z])/g, function($1){return "_"+$1.toLowerCase();});
   };
   

3. toUnderscore()

   function getId(obj){
     return parseInt($(obj).attr('id').split("-").pop(), 10);
   String.prototype.toUnderscore = function(){
     return this.replace(/([A-Z])/g, function($1){return "_"+$1.toLowerCase();});
   };
   

4. toUnderscore()

   String.prototype.toUnderscore = function() {
     return this.replace(/(^[A-Z])/, function(match) {
       return match.toLowerCase();
     }).replace(/([A-Z])/g, function(match){
       return "_" + match.toLowerCase();
     });
   };
   

5. toUnderscore()

   String.prototype.toUnderscore = function() {
     var str = this.replace(/[A-Z]/g, function(s) {
       return "_" + s.toLowerCase();
     });
     while (str.charAt(0) === '_') {
       str = str.slice(1);
     return str;
   };
   ...
   

6. underscore()

   String.prototype.underscore = function() {
     return this.replace(/([a-z\d])([A-Z]+)/g, '$1_$2').replace(/[-\s]+/g, '_').toLowerCase();
   };
   

7. underscore()

   String.prototype.underscore = function() {
     return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
   };
   

8. underscore()

   String.prototype.underscore = function() {
     return this
       .replace(/::/g, '/')
       .replace(/([A-Z]+)([A-Z][a-z])/g, '$1_$2')
       .replace(/([a-z\d])([A-Z])/g, '$1_$2')
       .replace(/-/g, '_')
       .toLowerCase();
   };
   

9. underscore()

   String.prototype.underscore = function() {
     return this.trim().toLowerCase().replace(/[\s]+/g, '_');