Object类中常用的几种方法

// Object.assign()
const target = { a: 1, b: 2 }
const source = { b: 4, c: 5 }
const returnedTarget = Object.assign(target, source)
console.log(target)
// expected output: Object { a: 1, b: 4, c: 5 }
console.log(returnedTarget)
// expected output: Object { a: 1, b: 4, c: 5 }

// Object.keys()
const object1 = {
  a: 'somestring',
  b: 42,
  c: false
}
console.log(Object.keys(object1))
// expected output: Array ["a", "b", "c"]

// Object.values()
const object1 = {
  a: 'somestring',
  b: 42,
  c: false
}
console.log(Object.values(object1))
// expected output: Array ["somestring", 42, false]

// Object.entries()
const object1 = {
  a: 'somestring',
  b: 42
}
for (let [key, value] of Object.entries(object1)) {
  console.log(`${key}: ${value}`)
}
// expected output:
// "a: somestring"
// "b: 42"
// order is not guaranteed