TDD Pig Latin Building out a pig latin translator step by step using test driven development.

README.md

#TDD Pig Latin

A translator from English to Pig Latin, written javascript.

Running the tests

Tests run from the command line using node. If you don't have node, you can get it [here](http://nodejs.org/ here).

Run the tests:

node test

piglatin.js

function ay(str) {
  return str + 'ay';
}

function translateWord(str) {
  if (/^[aeiou]/i.test(str)) {
    return ay(str);
  }
  if (/^[A-Z]/.test(str)) {
    return ay(str[1].toUpperCase() + str.substring(2) + str[0].toLowerCase());
  }
  return ay(str.substring(1) + str[0]);
}

exports.translate = function (str) {
  return str.replace(/\b\w+\b/g, translateWord);
};

test.js

var assert = require('assert');

var pigLatin = require('./piglatin.js');

function assertCorrectTranslation(input, expected) {
  try {
    var pig = pigLatin.translate(input);
    assert.equal(pig, expected, '"'+input+'" should translate to "'+expected+'", but was "'+pig+'"');
    console.log('PASSED');
  } catch (er) {
    console.log('FAIL!!! '+er.message);
  }
}

assertCorrectTranslation('hello', 'ellohay');
assertCorrectTranslation('hello world', 'ellohay orldway');
assertCorrectTranslation('Hello World', 'Ellohay Orldway');
assertCorrectTranslation('Hello, World!!', 'Ellohay, Orldway!!');
assertCorrectTranslation('I eat apples', 'Iay eatay applesay');