Nodejs String to Underscore underscore()

Method Source Code

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();
};

Related

1. 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])) {
   ...
   

2. underscore()

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

3. 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();
   };
   

4. 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();
   };
   

5. underscore()

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

6. underscorize()

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