Javascript

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var StopWatch = function( startOnCreation ){

    this.start = function(){
        startTime = new Date( endTime === null ? 0 : endTime );
        endTime = null;
    };

    this.stop = function(){
        endTime = startTime.getTime();
        startTime = null;
    };

    this.startStop = function(){
        startTime === null ?
            this.startWatch() :
            this.stopWatch();
    };

    this.getTime = function(){
        return (
            startTime !== null ?
                startTime.getTime() :
                endTime
            ).toString();
    };

    this.reset = function( startOnReset ){
        endTime = null;

        if( !!startOnReset ){
            this.startWatch(); }
    };

    var startTime = null,
        endTime = null;

    this.reset( startOnCreation );
};

StopWatch.prototype.toString = function( ){
    return this.getTime().toString();
};

// --- Example 0 ---
var myStopWatch = new StopWatch();
myStopWatch.start();

    //
    // Do some complicated stuff...
    //

myStopWatch.stop();
print( "Time passed [ " + myStopWatch + "ms ]" ); // asuming we have a print method

// --- Example 1 ---
myStopWatch.reset(); // recycle the first instance

    //
    // Do come complicated stuff...
    //
    print( "[ " + myOtherStopWatch + "ms ] have passed." );

myOtherStopWatch.stop();
print( "A total of [ " + myOtherStopWatch + "ms ] have passed." );