Answers for "js spread parameters"


spread operator in javascript

// spread operators can be used for arrays or objects

// cloning to prevent mutation.
let numList = [1,2,3];
let numListClone = [...numList]; // [1, 2, 3]

// spread operator for destructuring.
let animal = {
  name: 'dog',
  color: 'brown',
  age: 7
let { age, ...otherProperties } = animal; 

// spread operator as rest operator
function sum(x, y, {}

// spread operator for merging arrays or objects
let numLists = [...numList1, ...numList2];
let animalWithBreed = {
  breed: '',
Posted by: Guest on December-03-2020

array spread operator in javascript

let arr1 = ['A', 'B', 'C'];

let arr2 = ['X', 'Y', 'Z'];

let result = [...arr1, ...arr2];

console.log(result); // ['A', 'B', 'C', 'X', 'Y', 'Z']
// spread elements of the array instead of taking the array as a whole
Posted by: Guest on May-25-2020

spread operator javascript

obj = {first_name : "Marty",
    lovers: ["Jennifer Parker","Baines McFly"]
let objClone = { ...obj }; // pass all key:value pairs from an object 

// { first_name: "Marty", lovers: ["Jennifer Parker", "Baines McFly"] }
Posted by: Guest on December-16-2020

js spread parameters

// seperate each element of array using ...
let list = ['a','b','c'];
let copy = [...list, 'd', 'e']; // ['a', 'b', 'c', 'd', 'e']
//use for infinite parameters to a function
function toDoList(...todos) {
  //todos is an array, so it has map function
    `<ul>${ => `<li>${todo}</li>`).join("")}</ul>`
toDoList("wake up", "eat breakfast", ...list); //ul containing: wake up eat breakfast a b c
Posted by: Guest on January-25-2021

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