무우너의 먹물 기록

1. Optional Chaining { const person1 = { name : 'octopus-head', job : { title : 'student', professor : { name : '3J', }, }, }; const person2 = { name : '3J', }; function printManager(person){ console.log(person.job.manager.name); } printManager(person1); //오류 X printManager(person2); //오류 발생 { function printManager(person) { console.log(person.job ? person.job.manager ? person.job.manager.name :..

1. Shorthand property names : key와 name이 동일한 경우에는 짧게 작성 가능 { const chaz = { name : 'Chaz', age : '23' }; const name = 'Chaz'; const age = 23; const chaz2 = { //name : name, name, //age : age age }; } 2. Destucturing assignment //object { const student = { name ='Chaz', level :1, }; { const name = student.name; const level = student.level; console.log(name, level); } { const {name, level} = stude..