13. Default parameters, 파라미터 기본값 할당 방법

😌 function parameter 의 기본값을 설정해줄 수 있다

✨ size = size || 1

function sum(value, size) {
  size = size || 1 ; // default 1
  return value * size;
}

console.log(sum(3));

🔎 console

---

3

✨ {size=3}

function sum(value, size=3) {
  return value * size;
}

console.log(sum(3));

🔎 console

---

9

✨ {size={value:1}}

function sum(value, size={value:1}) {
  return value * size.value;
}

console.log(sum(3,{value:3}));
console.log(sum(3));

🔎 console

---

9
3

Reference

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https://www.inflearn.com/course/es6-강좌-자바스크립트/dashboard (opens new window)

https://jsbin.com/ (opens new window)