destrukturowanie zagnieżdżonych przedmiotów
const obj = {a: {b: 'xyz'}};
const {a: {b}} = obj;
console.log(b); // xyz
Scriper
const obj = {a: {b: 'xyz'}};
const {a: {b}} = obj;
console.log(b); // xyzconst person = {
name: 'labib',
age: 22,
job: 'web-developer',
frieds: ['ahsik', 'abir', 'alvi', 'hanafi'],
childList: {
firstChild: 'Salman',
secondChild: 'Rafi',
thirdChild: 'Anfi'
}
}
const { frieds: [a, b, c] } = person; //array destructuring from a nested object
console.log(a, b, c);
//expected output: ahsik abir alvi;
const { childList: { firstChild, secondChild } } = person; //object destructuring from a nested object
console.log(firstChild, secondChild)
//expected output:Salman Raficonst person = {
id: 0133,
name: "Robert",
positon: "web-developer",
salary: 8000,
pColor: "red",
pSports: "football",
pMovies: ["word war 1", "destroy the world", "long way", "Where is my home"],
pChild: {
firstChild: "Adiba",
secondChild: "Alvi"
}
}
const { secondChild } = person.pChild;
console.log(secondChild);
//Output: Alvi
const myFunc = ({event: {target: {name,secondName}}}) => {
console.log(name);
console.log(secondName);
}
myFunc({event: {target: {name: 'fred'}}})// nested array elements
const arrValue = ['one', ['two', 'three']];
// nested destructuring assignment in arrays
const [x, [y, z]] = arrValue;
console.log(x); // one
console.log(y); // two
console.log(z); // three// Destructuring an object > array > object structure
const returnedObject = {
docsArray: [
{socketRoom: '', routes: []},
{socketRoom: '', routes: []},
{socketRoom: '', routes: []},
]
}
// this will destructure the first and second elements from docsArray, and spread the remainder
const {docsArray: [element0, element1, ...remainder]} = returnedObject
// taking this further with destructing properties from element0
const {docsArray: [{socketRoom0, routes0} = element0, {socketRoom1, routes1} = element1]} = returnedObject
// note the syntax for destructing Objects and Arrays
const {propName} = Object
const [element0, element1] = Array
// then one layer deep where Object[propName] is an Array
const {propName: [element0]} = Object
// then two layers, where element0 is an Object
const {propName: [{propName} = element0]}
// three layers
const {propName: [{propName: [element00]} = element0]}