function similarity(phrases){
	if(phrases.length==2){
		similarity = 0.58;
		return similarity;
	}else{
		throw "error";

	}
}

setInterval(function(){
	console.log(similarity(["test1","test2"]));
	},2000);





G:\TwitterBot>node test.js
0.58

G:\TwitterBot\test.js:12
        console.log(similarity(["test1","test2"]));
                    ^
TypeError: number is not a function
    at Timer.<anonymous> (G:\TwitterBot\test.js:12:14)
    at Timer.exports.setInterval.timer.ontimeout (timers.js:234:14)