5 ميزات غير معروفة لـ JSON.stringify ()

//   user
const user = {
    name: 'Harry Heman',
    age: 29,
    job: 'developer'
}

//    ,    toString(),     
console.log(user.toString()) // [object Object]

console.log(JSON.stringify(user)) // {"name":"Harry Heman","age":29, "job": "developer"}

1. استخدام مصفوفة كوسيطة ثانية

let users = [
    {
        id: 1,
        login: 'harry',
        password: 'qwerty',
        status: 'admin',
        access: true
    },
    {
        id: 2,
        login: 'alice',
        password: 'qwerty',
        status: 'user'
    },
    {
        id: 3,
        login: 'bob',
        password: 'qwerty',
        status: 'user'
    },
    {
        id: 4,
        login: 'john',
        password: 'qwerty',
        status: 'user'
    },
    {
        id: 5,
        login: 'jane',
        password: 'qwerty',
        status: 'user'
    }
]

[{"id":1,"login":"harry","password":"qwerty","status":"admin", "access": true},{"id":2,"login":"alice","password":"qwerty","status":"user"},{"id":3,"login":"bob","password":"qwerty","status":"user"},{"id":4,"login":"john","password":"qwerty","status":"user"},{"id":5,"login":"jane","password":"qwerty","status":"user"}]

console.log(JSON.stringify(users, ['id', 'access'])) // [{"id":1,"access":true},{"id":2},{"id":3},{"id":4},{"id":5}]

2. استخدام دالة كوسيطة ثانية

const result = JSON.stringify(users, (key, value) => {
    if (typeof value === 'string') return undefined

    return value
})

console.log(result) // [{"id":1,"access":true},{"id":2},{"id":3},{"id":4},{"id":5}]

3. استخدام رقم كمعلمة ثالثة

console.log(JSON.stringify(user, null, 2))

{
  "name": "Harry Heman",
  "age": 29,
  "job": "developer"
}

4. استخدام سلسلة كوسيطة ثالثة

console.log(JSON.stringify(user, null, '->'))

{
->"name": "Harry Heman",
->"age": 29,
->"job": "developer"
}

5. toJSON الأسلوب

const user = {
    first: 'Harry',
    last: 'Heman',
    age: 29,
    toJSON(){
        return {
            full: `${this.first} ${this.last}`
        }
    }
}

console.log(JSON.stringify(user)) // "full": "Harry Heman"

علاوة

const url = 'https://jsonplaceholder.typicode.com/users'

asyncAwaitFetch()
async function asyncAwaitFetch(){
    try {
        const response = await fetch(url)
        const data = await response.json()
        console.table(data)
    } catch (error){
        console.error(error)
    } finally {
        console.log('')
    }
}