Javascript Object Extraction

Javascript adalah bahasa pemrograman yang sering digunakan untuk berbagai macam web.

Object.entries(user).forEach(entry => {
    const [key, value] => entry

    console.log(`The ${key} is ${value}`) ;

});

Object entries menggunakan map

let user = {
  name: 'Balaji',
  age: 23,
};
let entries = Object.entries(user);
let data = entries.map(([key, val] = entry) => {
  return `The ${key} is ${val}`;
});
data; //  ["The name is Balaji", "The age is 23"]

Mengambil key dari sebuah object menjadi Array

let user = {
  name: 'Balaji',
  age: 23,
  greet: () => 'Hello',
};
let keys = Object.keys(user);
keys; //["name", "age", "greet"]

Extract Object mendapatkan key dan value dan diolah menjadi array

const obj = { name: 'Adam', age: 20, location: 'Nepal' };

// returns properties in key-value format
console.log(Object.entries(obj));

// Output:  [ [ 'name', 'Adam' ], [ 'age', 20 ], [ 'location', 'Nepal' ] ]

Style Berbeda Mengekstrak Object lainnya menggunakan method for :

const obj = { name: 'John', age: 27, location: 'Nepal' };

// iterate through key-value pairs of object
for (const [key, value] of Object.entries(obj)) {
  console.log(`${key}: ${value}`);
}

Contoh menggunakan Object entries di array data

Sample array data dari database :

const arrayData = [
  { id: 1, label: 'Jakarta', value: 1 },
  { id: 2, label: 'Bandung', value: 2 },
  { id: 3, label: 'Surabaya', value: 3 },
  { id: 4, label: 'Jambi', value: 4 },
];

arrayData.map((item) => {
    Object.entries(item).forEach(entry => {
        const [key, value] => entry

        if(key == 'label') {
            console.log(value)
        }

    });
})