joykare / string-class

Checkpoint 2

String Class

Description

This is an extension of the String Class in JavaScript. The new methods support more string manipulation features.

Additional Methods

• hasVowels (typeof Boolean): Returns true if the string contains vowels. This method must implement Regular Expression.

  expect(typeof 'hey'.hasVowels()).toBe('boolean');
  expect('I love you'.hasVowels()).toBe(true);
  expect('crypt'.hasVowels()).toBe(false);

• toUpper (typeof String): Returns the String in question but with all characters in upper cases as applicable. This method should be implemented without the use of the toUpperCase internal methods.

  expect(typeof 'maybe'.toUpper()).toBe('string');
  expect('I miss you'.toUpper()).toBe('I MISS YOU');
  expect('YEAY'.toUpper()).toBe('YEAY');
  expect('nOP'.toUpper()).toBe('NOP');

• toLower (typeof String): Returns the String in question but with all characters in their lower cases as applicable. This method should be implemented without the use of the toLowerCase internal methods.

  expect(typeof 'MAYBE'.toLower()).toBe('string');
  expect('I MIss YOU'.toLower()).toBe('i miss you');
  expect('LOL'.toLower()).toBe('lol');

• ucFirst (typeof String): Returns the String in question but changes the First Character to an Upper case. Make use of your toUpper method above to implement this method or a one-liner.

  expect(typeof 'wink'.ucFirst()).toBe('string');
  expect('hallo'.ucFirst()).toBe('Hallo');
  expect('hallo there lady'.ucFirst()).toBe('Hallo there lady');

• isQuestion (typeof Boolean): Return true if the string is a question (ending with a question mark). This method must implement Regular Expression.

  expect(typeof 'Whats up?'.isQuestion()).toBe('boolean');
  expect('Is the world yours, on a blimp?'.isQuestion()).toBe(true);
  expect('What\'s your name'.isQuestion()).toBe(false);
  expect('H?allo'.isQuestion()).toBe(false);

• words (typeof Object, instanceof Array): Returns a list of the words in the string, as an Array. This method must implement Regular Expression.

  expect(typeof 'A proper list of words'.words()).toBe('object');
  expect(Array.isArray('dont know what'.words())).toBeTruthy();
  expect('list of something'.words()).toEqual(['list', 'of', 'something']);

• wordCount (typeof Number): Returns the number of words in the string. It must make use of the words method above.

  expect(typeof 'A proper list of words'.wordCount()).toBe('number');
  expect('list of something'.wordCount()).toEqual(3);

• toCurrency (typeof String): Returns a currency representation of the String e.g 11111.11 should be represented as 11,111.11.

  expect(typeof '1000'.toCurrency()).toBe('string');
  expect('1000'.toCurrency()).toBe('1,000.00');
  expect('1000.50'.toCurrency()).toBe('1,000.50');

• fromCurrency (typeof Number): Returns a number representation of the Currency String e.g 11,111.11 should return 11111.11

  expect(typeof '1,000'.fromCurrency()).toBe('number');
  expect('1,000'.fromCurrency()).toEqual(1000);
  expect('1,000,000'.fromCurrency()).toEqual(1000000);

Motivation

Checkpoint 2. Clone repo and run it yourself.