js destructuring function parameters code example
Example 1: javascript object destructuring
//simple example with object------------------------------
let obj = {name: 'Max', age: 22, address: 'Delhi'};
const {name, age} = obj;
console.log(name);
//expected output: "Max"
console.log(age);
//expected output: 22
console.log(address);
//expected output: Uncaught ReferenceError: address is not defined
// simple example with array-------------------------------
let a, b, rest;
[a, b] = [10, 20];
console.log(a);
// expected output: 10
console.log(b);
// expected output: 20
[a, b, ...rest] = [10, 20, 30, 40, 50];
console.log(rest);
// expected output: Array [30,40,50]
Example 2: how destructuring works in javascript
//destructuring in javascript
const objA = {
prop1: 'foo',
prop2: {
prop2a: 'bar',
prop2b: 'baz',
},
};
// Deconstruct nested props
const { prop1, prop2: { prop2a, prop2b } } = objA;
console.log(prop1); // 'foo'
console.log(prop2a); // 'bar'
console.log(prop2b); // 'baz'
Example 3: destructuring Array in JavaScript
function getArray() {
return ["Hello", "I" , "am", "Sarah"];
}
let [greeting,pronoun] = getArray();
console.log(greeting);//"Hello"
console.log(pronoun);//"I"