クロージャを使ってカウントアップ処理

closure.js

function playFunc(n) {
  if(n === 1){
    console.log('奇数');
  } else {
    console.log('偶数');
  }
}

function counter(){
    var count = 0;
    return function() {
        if(count === 2 ) {
          count = 1;
        } else {
          count++;
        }
        playFunc(count);
    };
}

var num = counter();
setInterval(function(){
  num();
}, 1000);

closure2.js

function counter(n) {
	var cnt = n || 0;
	return {
		get: function() {
			cnt++;
			return cnt;
		},
		reset: function() {
			cnt = 0;
			return cnt;
		}
	};
}

var countUp = counter(0);

console.log(countUp.get());  // 1
console.log(countUp.get());  // 2
console.log(countUp.get());  // 3
console.log(countUp.reset());  // 0
console.log(countUp.get());  // 1
console.log(countUp.get());  // 2
console.log(countUp.get());  // 3