Week 2 Review

Question 1

if statement

Answer 1

if(boolean expression){

};

Question 2

Difference between == and ===

Answer 2

=== has no type conversion

Question 3

if-else statement

Answer 3

if(boolean experession){
} else {
}

Question 4

The “and” operator

Answer 4

&&

Question 5

The “or” operator

Answer 5

||

Question 6

the “not” operator

Answer 6

!

Question 7

switch statement

Answer 7

switch(variable) {
   case var_val_1:
  break;
  case var_val_2:
  break;
  default:
}

Question 8

while statement

Answer 8

while (boolean) {

}

Question 9

for statement

Answer 9

for (let i =1; i<5, i++){
}

Question 10

declare a variable a with string value

Answer 10

a = “ a sentence”; or a = ‘a sentence’;

Question 11

Operator to concatenate a string

Answer 11

+

Question 12

concatinate a string with +=

Answer 12

String1 = ‘one’

String1 += ‘two’

Question 13

find length of string

Answer 13

myString = “William”

myString.length

Question 14

get second character of a string

Answer 14

myString = ‘William”

myString[1]

Question 15

Create an array in JS

Answer 15

myArray[]

Question 16

include a value in a string

Answer 16

my name is ${varble_with_name}

not these are backticks and not single quotes

Question 17

code to send a message to the browser window

Answer 17

alert(‘that is a no no!’ )

Question 18

code to ask a question of the user in browser window

Answer 18

prompt(‘What is your mother’s name’ )

Question 19

keyword to declare a variable that does not change

Answer 19

const

Question 20

let and const are ________ scoped variables

Answer 20

block

Question 21

a piece of code that produces a value

Answer 21

expression

Question 22

add X to end of an array called array1

Answer 22

array.push(X)

Question 23

delete the last element of an array called array1

Answer 23

array.pop()

Question 24

remove the first element of an array called array1

Answer 24

array1.shift()

Question 25

add to the beginning of an array

Answer 25

array1.unshift(x)