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(Fully commented, OOP approach.)
| Date: | 03/28/08 |
| Author: | Ariel Flesler |
| URL: | http://flesler.blogspot.com |
| Comments: | 0 |
| Info: | http://www.w3schools.com/js |
| Score: |  (2.96 in 27 votes) |
/**
* @projectDescription Javascript snippet to generate the lyrics of the song "99 Bottles".
* Copyright (c) 2008 Ariel Flesler - aflesler(at)gmail(dot)com | http://flesler.blogspot.com
* Date: 3/27/2008
* @author Ariel Flesler
* --This script follows the standard specified by scriptDoc: http://scriptdoc.org/
*/
/**
* @classDescription This class generates the lyrics of the song "99 Bottles".
* @return { Song } Returns a new Song Object.
* @constructor
*/
var Song = function(){};
//add methods to the prototype, to affect the instances of the class Song
Song.prototype = {
/**
* Maps an array of items using a function.
* @param { Array } src Source array whose items will be mapped.
* @param { Function } fn Function that receives each item & index and returns the mapped item.
* @return { Array } The mapped array.
* @method
* http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Global_Objects:Array:map
*/
map: function( src, fn ){
var
mapped = [ ], //will hold the mapped items
pos = src.length; //holds the actual index
//do a reversed loop as we know the last index
while( pos-- )
mapped[pos] = fn.call( this, src[pos], pos );
return mapped;
},
/**
* @param { Number } amount Specifies the # of bottle.
* @return { String } The related text.
* @method
*/
bottle:function( left ){
switch( left ){
case 0: return 'no more bottles';
case 1: return '1 bottle';
default: return left + ' bottles';
}
},
/**
* @param { Number } amount The amount of bottles to buy.
* @method
*/
buy:function( amount ){
this.bottles = Array(amount+1);
},
/**
* @param { String } separator String to separate each line.
* @return { String } Lyrics of the song.
* @method
*/
sing:function( separator ){
var lines = this.map( this.bottles, function( bottle, left ){
bottle = this.bottle( left );//the text for this bottle, and then the next one.
var nextBottle = left - 1 + ( left ? 0 : this.bottles.length );
nextBottle = this.bottle( nextBottle );
return this.apply( this.line1, bottle ) + separator +
this.apply( left ? this.line2a : this.line2b, nextBottle );
});
return lines.reverse().join( separator+separator );
},
caseRegex: /%([ul])/g, //matches %u or %l
/**
* @param { String } template String template of the line.
* @param { String } bottle The text for this bottle.
* @return { String } The parsed template.
* @method
*/
apply:function( template, bottle ){
return template.replace( this.caseRegex, function( all, kase ){
return kase == 'l' ? bottle //lowercase
: bottle.charAt(0).toUpperCase() + bottle.slice(1); //uppercase
});
},
line1: '%u of beer on the wall, %l of beer.',
line2a: 'Take one down and pass it around, %l of beer on the wall.',
line2b: 'Go to the store and buy some more, %l of beer on the wall.'
};
var bottlesSong = new Song();
bottlesSong.buy( 99 );
var lyrics = bottlesSong.sing( '<br />' );
document.body.innerHTML = lyrics;
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Alternative Versions
| Version | Author | Date | Comments | Rate |
|---|---|---|---|---|
| Eponymous obfuscated version | JavaScribe | 01/09/09 | 4 | |
| using DOM and a closure | Christof Donat | 03/07/06 | 0 | |
| 3 | Brian Patrick Lee | 04/20/05 | 3 | |
| With english numbers, DOM, and callbacks | Joseph Taylor | 01/18/08 | 0 | |
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