Spread Operator

Question 1

function sum(x, y, z) {
  return x + y + z;
}

const numbers = [1, 2, 3, 5];

console.log(sum(_________));

Answer 1

…numbers

Question 2

function sum(x, y, z) {
  return x + y + z;
}

const numbers = [1, 2, 3, 5];

console.log(sum(…numbers)); //

Answer 2

expected output: 6

only takes in x,y,z

Question 3

function sum(x, y, z) {
  return x + y + z;
}

const numbers = [1, 2, 3];

console.log(sum(…numbers)); //

Answer 3

expected output: 6

Question 4

const numbers = [1, 2, 3];

console.log(…numbers)); //

Answer 4

1,2,3

numbers

Question 5

const numbers = [1, 2, 3];

console.log(numbers)); //

Answer 5

[1,2,3]

array

Question 6

let certs = [“aaa”,’bbb’,”ccc”];
let certValid = [222, 111, …certs, 333];

console.log(certValid);

Answer 6

[222, 111, “aaa”, “bbb”, “ccc”, 333]

Question 7

let certs = [“aaa”,’bbb’,”ccc”];
let certValid = [222, 111, certs, 333];

console.log(certValid);

Answer 7

[222, 111, [ “aaa”, “bbb”, “ccc”], 333]

adds the array into another array as an array

Question 8

function sum(x, y, z) {
  return x + y + z;
}

const numbers = [1, 2, 3];

console. log(sum(…numbers)); // spread operator
console. log(sum(_______)); // WRITE OLD WAY

Answer 8

console.log(sum(numbers1[0],numbers1[1],numbers1[2]));

Question 9

const numbers = [1, 2, 3];
const numbers2 = // copy array with spread

Answer 9

const numbers2 = […numbers];

Question 10

let certs2 = […certs];
let certs = [“aaa”,’bbb’,”ccc”];

console.log(certs === certs2); // TRUE / FALSE

Answer 10

FALSE

OBJECTS are not the same in memory.

Question 11

let array1 = [1,2,3];
let array2 = [4,5,6];

let array3 = […array1, array2];
console.log(array3);

Answer 11

[1, 2, 3, [4,5,6]

Question 12

let array1 = [1,2,3];
let array2 = [4,5,6];

let array3 = […array1, …array2];
console.log(array3);

Answer 12

[1, 2, 3, 4, 5, 6];

Question 13

let array1 = [1,2,3];
let array2 = [4,5,6];

// concat with method
// concat with spread operator

Answer 13

array1.concat(array2);

let array3 = […array1, …array2];

Question 14

the …spread operator does 4 things.

Answer 14

1. //adds elements of an existing array into an new array.
2. // pass elements of an array as arguments to a function
3. // copy array
4. // concat arrays

Question 15

the _______ condenses an array

Answer 15

…rest

Question 16

the ______ spreads out an array

Answer 16

…spread

Question 17

the rest operator ______ into an array

Answer 17

condense multiple elements

Question 18

var x = function  (...n){
}

in this block of code N will become ?

Answer 18

an array

Question 19

var x = function (){
    console.log(arguments);
    };

x(1,2,3) // returns?

Answer 19

an array like object but NOT an array

Question 20

When you pass an argument as a spread operator it’s called a _____

Answer 20

rest parameter