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March 28, 2020 02:17
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I expected fnc prints MyClass, at least the last one, but actually it printed undefined.
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| 'use strict' | |
| function MyClass() { | |
| function fnc() { | |
| console.log(this, 'in fnc'); | |
| } | |
| const arrow = () => { | |
| console.log(this, 'in arrow'); | |
| } | |
| const bind = function() { | |
| console.log(this, 'in bind'); | |
| }.bind(this) | |
| this.method = () => { | |
| fnc(); // undefined | |
| arrow(); // MyClass | |
| bind(); // MyClass | |
| console.log(this, ' in method.'); // MyClass | |
| } | |
| fnc(); // undefined | |
| } | |
| const obj = new MyClass(); | |
| obj.method(); |
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