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| // code from https://developer.mozilla.org/ko/docs/Web/JavaScript/Reference/Functions/%EC%95%A0%EB%A1%9C%EC%9A%B0_%ED%8E%91%EC%85%98 | |
| var materials = [ | |
| 'Hydrogen', | |
| 'Helium', | |
| 'Lithium', | |
| 'Beryllium' | |
| ]; | |
| materials.map(function(material) { | |
| return material.length; | |
| }); // [8, 6, 7, 9] | |
| materials.map((material) => { | |
| return material.length; | |
| }); // [8, 6, 7, 9] | |
| materials.map(({length}) => length); // [8, 6, 7, 9] |
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