Nodejs String to Underscore underscore()

Method Source Code

/**//from  w ww .j a va  2 s . com
 *  String#underscore() -> String
 *
 *  Converts a camelized string into a series of words separated by an
 *  underscore (`_`).
 *
 *  ##### Example
 *
 *      'borderBottomWidth'.underscore();
 *      // -> 'border_bottom_width'
 *
 *  ##### Note
 *
 *  Used in conjunction with [[String#dasherize]], [[String#underscore]]
 *  converts a DOM style into its CSS equivalent.
 *
 *      'borderBottomWidth'.underscore().dasherize();
 *      // -> 'border-bottom-width'
**/
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();
};

Related

1. toUnderscore()

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

2. 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;
   };
   ...
   

3. toUnderscore()

   String.prototype.toUnderscore = function() {
     var str = this;
     var modified = '';
     for (var i = 0; i < str.length; i++) {
       if (isLower(str[i])) {
         modified += str[i];
       } else {
         if (str.length > i-1) {
           if (isLower(str[i-1])) {
   ...
   

4. underscore()

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

5. 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();
   };
   

6. underscore()

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

7. underscore()

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

8. underscorize()

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