Ad. Javascript.info part 3

Question 1

two ways of thinking in javascript

Answer 1

Iterative thinking: the for loop:

Recursive thinking: simplify the task and call self:

Question 2

Generally what is shorter solution, recursive solution or iterative solution?

Answer 2

A recursive solution

Question 3

___________ is an internal data structure that contains details about the execution of a function

Answer 3

The execution context

Question 4

__________ algorithm is more memory-saving:

Answer 4

A loop-based iteration Iterative

Question 5

_________ method returns an object with two properties done and value. You can also provide a parameter to the next method to send a value to the generator.

Answer 5

The next()

Question 6

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

alert( sum(1, 2, 3, 4, 5) );

RETRUNS

Answer 6

3

Question 7

The “rest parameters” can be mentioned in a function definition with ______

Answer 7

three dots

Question 8

function sumAll(...args) { 
  let sum = 0;

for (let arg of args) sum += arg;

return sum;
}

alert( sumAll(1, 2, 3) ); //

Answer 8

6

Question 9

function sumAll(\_\_\_\_\_\_\_\_\_\_\_\_) { <=== use spread operator
  let sum = 0;

for (let arg of args) sum += arg;

return sum;
}

alert( sumAll(1, 2, 3) ); //

Answer 9

…ARG

Question 10

The …rest must always be ________

Answer 10

LAST

Question 11

Arrow functions do not have an array-like object named _________ as well as _________

Answer 11

arguments method

this

Question 12

function f(arg1, ...rest, arg2) { 
}

// RETURNS?

Answer 12

// error

…rest needs to be at the end

Question 13

arrow functions do not have “arguments” because

Answer 13

it takes them from the outer “normal” function.

Question 14

let arr = [3, 5, 1];

alert( Math.max(arr) ); //

Answer 14

NAN

max cant manually list items in the code

Question 15

let arr = [3, 5, 1];

alert( Math.max(…arr) //

Answer 15

5

Question 16

When using SPREAD OR REST, you are expanding a single variable into more

Answer 16

spread

Question 17

When using SPREAD OR REST, arguments, you are collapsing all remaining arguments of a function into one array:

Answer 17

REST

Question 18

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

alert( Math.max(…arr1, …arr2) ); //

Answer 18

8

Question 19

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

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

Answer 19

25

Question 20

let str = “Hello”;

alert( […str] );

// THIS RETURNS

Answer 20

H,e,l,l,o

Question 21

let str = “Hello”;

alert( …str ); //

Answer 21

H

Question 22

The SPREAD OR ARRAY.FROM operates only on iterables.

Answer 22

SPREAD

Question 23

SPREAD OR ARRAY.FROM operates on both array-likes and iterables.

Answer 23

ARRAY.FROM

Question 24

an example of a recursive solution is the ___ statement

Answer 24

If

Question 25

ARRAY.FROM

Answer 25

operates on both array-likes and iterables.

Question 26

SPREAD

Answer 26

operates only on iterables.