ActiveSupport.js

Active Support for Javascript

String#singularize

expect('cloves'.singularize()).toEqual('clove');
expect('soliloquies'.singularize()).toEqual('soliloquy');
expect('series'.singularize()).toEqual('series');

String#pluralize

expect('post'.pluralize()).toEqual('posts');
expect('person'.pluralize()).toEqual('people');
expect('man'.pluralize()).toEqual('men');

Pluralize also accepts a number that dictates pluralization:

expect('chicken'.pluralize(2)).toEqual('chickens');
expect('chicken'.pluralize(1)).toEqual('chicken');

var errorCount = 1;
expect('error'.pluralize(errorCount)).toEqual('error');

String#possessiveize

expect("friend".pluralize()).toEqual("friend's");
expect("octopus".possessiveize()).toEqual("octopus's");
expect("children".pluralize()).toEqual("children's");

String#camelize

it('changes a string to camelcase', function() {
  expect('active_model'.camelize()).toEqual('ActiveModel');
  expect('active_model_party'.camelize()).toEqual('ActiveModelParty');
});

it('leaves acronyms uppercase', function() {
  expect('HTML_parser'.camelize()).toEqual('HTMLParser');
});

String#underscore

expect('ActiveModel'.underscore()).toEqual('active_model');
expect('SuperDuperClass'.underscore()).toEqual('super_duper_class');
expect('SuperHTMLParser'.underscore()).toEqual('super_html_parser');

String#hyphenate

expect('activeModel'.hyphenate()).toEqual('active-model');
expect('SuperDuperClass'.hyphenate()).toEqual('super-duper-class');
expect('SuperHTMLParser'.hyphenate()).toEqual('super-html-parser');

String#humanize

expect('employee_salary'.humanize()).toEqual('Employee salary');
expect('author_id'.humanize()).toEqual('Author');
expect('AuthorComments'.humanize()).toEqual('Author comments');

String#titleize

expect('man from the boondocks'.titleize()).toEqual('Man From The Boondocks');
expect('x-men: the last stand'.titleize()).toEqual('X-Men: The Last Stand');
expect('TheManWithoutAPast'.titleize()).toEqual('The Man Without A Past');
expect('raiders_of_the_lost_ark'.titleize()).toEqual('Raiders Of The Lost Ark');

String#classify

expect('posts'.classify()).toEqual('Post');
expect('sensors'.classify()).toEqual('Sensor');
expect('systems'.classify()).toEqual('System');
expect('team_projects'.classify()).toEqual('TeamProject');

String#toForeignKey

expect('post'.toForeignKey()).toEqual('post_id');
expect('Sensor'.toForeignKey()).toEqual('sensor_id');

String#ordinalize

expect('1'.ordinalize()).toEqual('1st');
expect('202'.ordinalize()).toEqual('202nd');
expect('4003'.ordinalize()).toEqual('4003rd');
expect('5004'.ordinalize()).toEqual('5004th');