Functios

Question 1

what is a function

Answer 1

set of instructions

Question 2

variables

Answer 2

hold number, strings and data types at given time

Question 3

why the variables are undefined?

Answer 3

if we didn’t put a value on it

Question 4

difference between var and let

Answer 4

when you use let, a variable with the same name can only be declared once.

Question 5

difference between let and const

Answer 5

Change the code so that all variables are declared using let or const. Use let when you want the variable to change, and const when you want the variable to remain constant.

Question 6

++; h –;

Answer 6

+1 h -1;

Question 7

a= a+=6 ; h shortcut a+=6;

Answer 7

otan prostheteis to proigoumeno
px a einai 5

Question 8

string

Answer 8

a string can be surrounded by single or double quotes

Question 9

+=

Answer 9

otan prostheteis kati me to proigoumeno

Question 11

.length

Answer 11

epistrefei to mikos

Question 12

javascript counting

Answer 12

begins from 0

Question 13

In JavaScript, String values are immutable, which means that they cannot be altered once created.

Answer 13

you can always reassign a String

Question 14

remove an item with pop function

Question 15

.shift() removes the first item

Answer 15

.pop() removes the last element of an array

Question 16

unshift()adds the elements of the begining of an array

Answer 16

shift() reads the first item

Question 17

What are parameters

Answer 17

variables that act as placeholders kai einai mesa stin parenthesi

Question 18

se kathe array vazo ena subarray kai meta vazo komma

Question 19

what are arguments

Answer 19

values that are passed to an argument

Question 20

local scope

Answer 20

sth inside a context and sth that contains let, const and myVar

Question 21

.push()

Answer 21

adds an item to the end of array

Question 22

.shift()

Answer 22

removes the first element of an array

Question 23

Strict equality (===) is the counterpart to the equality operator (==). However, unlike the equality operator, which attempts to convert both values being compared to a common type, the strict equality operator does not perform a type conversion.

Answer 23

If the values being compared have different types, they are considered unequal, and the strict equality operator will return false.
3 === 3 // true
3 === ‘3’ // false
In the second example, 3 is a Number type and ‘3’ is a String type.

Question 24

alt attribute

Answer 24

is used for screen readers to improve accessibility and is displayed if the image fails to load.

Question 25

<a></a> would link to freecodecamp.org.

Question 26

what is inline elements

Answer 26

both input and button elements are inline elements, which don’t appear on new lines.

Question 27

The id attribute is used to identify specific HTML elements. Each id attribute’s value must be unique from all other id values for the entire page.