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| function makeCounter() { | |
| let count = 0; | |
| return function() { | |
| return count++; | |
| }; | |
| } | |
| let counter = makeCounter(); | |
| let counter2 = makeCounter(); | |
| console.log( counter() ); // 0 | |
| console.log( counter() ); // 1 | |
| console.log( counter2() ); // ? | |
| console.log( counter2() ); // ? | |
| // Answer: 0 | |
| // Answer: 1 | |
| // because it has different lexical environment |