Practiced Kata: Check Writing from @TheIronYard--Orlando

check-writing.js

var assert = require('assert');

function test(actual, expected, success){
    success = success || 'pass!';

    assert.equal(actual, expected);

    console.log(success);
}

/**
 * Check Writing
 *
 * Given an Number representing money -- $1234.56 -- convert
 * that into it's string representation in English words. For
 * example, 1234.56 is "one thousand, two hundred thirty four
 * and 56/100s", just like you would see on a check.
 *
 * In a lot of ways, this is the inverse of the "String Calculator"
 * problem, so a lot of what you've learned there will be put into
 * practice here, but backwards. Hooray!
 */

/**
 * Sample Data:
 *
 * $ 1234.56 => "one thousand, two hundred thirty four and 56/100s"
 * $ 123.45  => "one hundred twenty three and 45/100s"
 * $ 12.34   => "twleve and 34/100s"
 * $ 1.23    => "one and 23/100s"
 *
 * EXTRA CREDIT!
 *
 * $ 12,345,678.90 =>
 * "twelve million, three hundred fourty five thousand, six hundred
 *   seventy eight and 90/100s"
 *
 * Make up your own, too.
 */

function toEnglish(value){
    if ( value === 6 ){
        return 'six';
    }
    if ( value === 5 ){
        return 'five';
    }
    if ( value === 4 ){
        return 'four';
    }
    if ( value === 3 ){
        return 'three';
    }
    if ( value === 2 ){
        return 'two';
    }
    if ( value === 1 ){
        return 'one';
    }
    return 'zero';
}

test(true, true, 'true is true!');

var testCases = [
    [ 0, 'zero' ],
    [ 1, 'one' ],
    [ 2, 'two' ],
    [ 3, 'three' ],
    [ 4, 'four' ],
    [ 5, 'five' ],
    [ 6, 'six' ],
];

var index = 0, testCase;

var actual, expected;

while ( index < testCases.length ){
    testCase = testCases[index];

    actual = toEnglish(testCase[0]);
    expected = testCase[1];

    test(actual, expected,
        testCase[0] + ' >> ' + testCase[1]
    );

    index++;
}