function feedPig(){ var pig; console.log(pig); pig = 812; console.log(pig);}feedPig();feedPig();
undefined812undefined812
class PigFeeder{ feedPig() { console.log(this.pig); this.pig = 812; console.log(this.pig); }}var obj = new PigFeeder();obj.feedPig();obj.feedPig();
undefined812812 <-- note the difference from above812