De-structuring

Question 1

What is destructuring, conceptually?

Answer 1

Assigning a property of an object to a variable.

variable name of destructuring should match property name of object pulling info from.

Question 2

What is the syntax for Object destructuring?

Answer 2

const {property : variable} = object

if variable has same name as property, just write the name.

able to assign value of properties.
able to give a property an unassigned property value.
person = {
currentAge:28
}
{currentAge: age = 18 } = person

Question 3

What is the syntax for Array destructuring?

Answer 3

const [variable at index] = array

let [x, y, z] = getScores();

console. log(x); // 70
console. log(y); // 80
console. log(z); // 90

Question 4

How can you tell the difference between destructuring and creating Object/Array literals?

Answer 4

creating curly brackets right side

destructuring curly brackets left side

Question 5

How to destructure a null object

Answer 5

let { firstName, lastName } = getPerson() || {};

use the or operator, firstName, lastName will return undefined.