Befor MapReduce

/**
 * Copyright pasodania ( http://wonderfl.net/user/pasodania )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/zItl
 */

package {
    import flash.display.Sprite;
    import flash.text.TextField;
    
    public class Main extends Sprite{
        public var output:TextField;
        public var swCnt:SimpleWordCounter;
        
        public function Main() {
            // write as3 code here..
            output = new TextField();
            swCnt = new SimpleWordCounter("abacaszca");
            output.appendText(swCnt.getCharCount("ca").toString());
            
            addChild(output);
        }
    }
}

import flash.display.Sprite;
import flash.text.TextField;
class SimpleWordCounter{
    private var _target:String;
    
    public function SimpleWordCounter(target:String){
        _target = target;
    }
    
    public function getCharCount(w:String):int{
        var now:int = 0;
        var result:int = 0;
        while( now <= _target.length){
            if( _target.indexOf(w, now) != -1 ){
                result++;
                now = _target.indexOf(w, now);
            }
            now++;
        }
        return result;
    }
}