Rest parameters and spread syntax

Question 1

function sum(a, b) {
return a + b;
}

alert( sum(1, 2, 3, 4, 5) ); // returns?

Answer 1

3

rest ignored

Question 2

function f(arg1, …rest, arg2) { // arg2 after …rest ?!
// returns and why
}

Answer 2

error

spread must be at end

Question 3

Arrow functions do not have ______

Answer 3

“arguments”

Question 4

let arr = [3, 5, 1];
alert( Math.max(arr) ); // NaN

how can we fix the above to return 5

Answer 4

alert( Math.max(…arr) );

spread operator

Question 5

let arr1 = [1, -2, 3, 4];
let arr2 = [8, 3, -8, 1];

alert( Math.max(…arr1, …arr2) ); //

Answer 5

8

Question 6

let arr1 = [1, -2, 3, 4];
let arr2 = [8, 3, -8, 1];

alert(/* write code here */ ); // 8

how to get max number

Answer 6

Math.max(…arr1, …arr2)

Question 7

let arr1 = [1, -2, 3, 4];
let arr2 = [8, 3, -8, 1];

alert( Math.max(1, …arr1, 2, …arr2, 25) ); // returns?

Answer 7

25

Question 8

let arr = [3, 5, 1];
let arr2 = [8, 9, 15];

let merged = [0, …arr, 2, …arr2];

alert(merged); //

Answer 8

0,3,5,1,2,8,9,15

Question 9

let arr = [3, 5, 1];
let arr2 = [8, 9, 15];

let merged = /* write code here */

alert(merged); // 0,3,5,1,2,8,9,15

Answer 9

[0, …arr, 2, …arr2];

Question 10

let str = “Hello”;

alert( /* write code here*/ ); // H,e,l,l,o

Answer 10

[…str]

Question 11

let str = “Hello”;
alert( […str] ); // H,e,l,l,o

the above is the same as______

Answer 11

Array.from(str)

Question 12

When … is at the end of function parameters, it’s “rest parameters” and _______

Answer 12

gathers the rest of the list of arguments into an array.