Figure out max vibration value

gistfile1.js

"use strict";

(function(global){

    if(typeof global.navigator.vibrate === 'function')
        return;

    var MAX = Math.floor(1000000*Math.random());
    console.log('MAX', MAX);
    
    global.navigator.vibrate = function vibrate(time){
        if(time === 0){
            console.log('vibrate canceled!')
            return;
        }
        if(time > MAX)
            throw new Error('I cannot vibrate for that long, dude!');
            
        console.log('vibrating for '+time+' ms', 'br'+Array(Math.floor(Math.log(time))).join('r'))
    }

})(this);

(function(){

    function tryVibrationTime(t){
        var vibrate = navigator.vibrate.bind(navigator);
    
        try{
            vibrate(t);
            vibrate(0); // cancelling the vibration to not annoy the user.
            // it worked since no error was thrown
            return true;
        }
        catch(e){ // oops, tried to vibrate for too long
            return false;
        }
    
    }
    
    function figureOutVibrationLimit(){
        var vibrateMin = 1;
        var vibrateMax;
        var attempt;
        
        while(vibrateMax === undefined && attempt !== Infinity){
            attempt = vibrateMin*2;
        
            if(tryVibrationTime(attempt))
                vibrateMin = attempt;
            else
                vibrateMax = attempt;
        }
        
        if(attempt === Infinity)
            return Infinity;
        
        // now we know the value is between vibrateMin and vibrateMax. DICHOTOMY!!!
        while(vibrateMax - vibrateMin > 1){
            attempt = Math.floor( (vibrateMin+vibrateMax)/2 );
            if(tryVibrationTime(attempt))
                vibrateMin = attempt;
            else
                vibrateMax = attempt;
        }
        
        return vibrateMin;
    }

    console.log(figureOutVibrationLimit());
})()