Syntax intro

Question 1

What is a template literal?

Answer 1

String literal that adds to expressions through interpolation.
Denoted by “ ` “ the backtick.

const myPet = 'armadillo';
console.log(`I own a pet ${myPet}.`);
// Output: I own a pet armadillo.

Question 2

What are template literals wrapped with?

Answer 2

Backticks.

`

Question 3

What operator is useful to check the data type of a variable’s value?

Answer 3

typeof

Question 4

What are strings wrapped with?

Answer 4

Apostrophes.

Question 5

What is the preferred way to declare a variable when it can be reassigned?

Answer 5

let

Question 6

What is the preferred way to declare a variable with constant value?

Answer 6

const

Question 7

What is the primitive data type of variables that have not been initialized?

Answer 7

undefined

Question 8

what operator is used to consecrate strings?

Answer 8

+

Question 9

What is a Method?

Answer 9

Methods return information about an object, and are called by appending an instance with a period ., the method name, and parentheses.

Question 10

return a floating-point, random number in the range from 0 (inclusive) up to but not including 1.

Answer 10

Math.random()

Question 11

return the largest integer less than or equal to the given number.

Answer 11

Math.floor()

Question 12

intentional absense of value

Answer 12

null

Question 13

Modulo

Answer 13

%
finds the remainder
10 % 5

Question 14

single line comment

Answer 14

//

Question 15

multi line comment

Answer 15

/* 
*/

Question 16

What is faster ABOVE 30 substrings, interpolation or concatenation?

Answer 16

Interpolation

Question 17

What is faster BELOW 30 substrings, interpolation or concatenation?

Answer 17

Concatenation

CON CAT E NATION

Question 18

method that finds length of a string

Answer 18

.length

Question 19

Is equal to

Answer 19

===

Question 20

or operator

Answer 20

||

Checked FIRST || LAST

Question 21

truthy or falsy?

Empty strings like “” or ‘’

Answer 21

falsy

Question 22

truthy or falsy?

‘Elliott’

Answer 22

Truthy.

Question 23

NaN

Answer 23

Not a number

Question 24

Ternary operator operators

Answer 24

? : ;

isLocked ? console.log(‘You will need a key to open the door.’) :
console.log(‘You will not need a key to open the door.’);

Question 25

Proper order?
A. else (){} if (){} else if
B. if (){} else (){} else if
C. if (){} else if (){} else

Answer 25

if / else if / else

Question 26

what is a switch statement

Answer 26

A switch statement provides an alternative syntax to else if that is easier to read and write. A switch statement looks like this:

switch (…) {
case ‘…’ :
ANYFUNCTION( );
break;

  case 'lime':
    console.log('Limes are $1.49');
    break;
  case 'papaya':
    console.log('Papayas are $1.29');
    break;
  default:
    console.log('Invalid item');
    break;
}

Question 27

break

Answer 27

tells the computer to exit the block and not execute any more code or check any other cases inside the code block.

Question 28

default

Answer 28

at the end of a switch statement, is the default outcome if all else fails.

Question 29

What will a switch statement do without a break?

Answer 29

the first matching case will run, but so will every subsequent case regardless of whether or not it matches—including the default.

Question 30

Bang operator

Answer 30

The bang operator, !, switches the truthiness and falsiness of a value.

Question 31

Strict inequality operator

Answer 31

!==

checks whether its two operands are not equal, returning in a boolean.

Question 32

Control flow

Answer 32

order in which statements are executed in a program.

Question 33

what is a condition

Answer 33

the enclosing brackets () after a logic statement

Question 34

control flow statements

Answer 34

if then else etc

Question 35

function

Answer 35

repeatable set of tasks

Question 36

What comes after the function keyword?

Answer 36

an identifier

Question 37

What is hoisting?

Answer 37

Accessing a function before it is called

Question 38

What is hoisting?

Answer 38

Accessing a function before it is defined

Question 39

What is hoisting?

Answer 39

Calling a function before it is defined

Question 40

What do parameters do?

Answer 40

Parameters allow functions to accept input(s) and perform a task using the input(s).

Question 41

Default parameters

Answer 41

function funtionName(parameter = 'Default Value', parameter2 = 100, parameter3  = true) {
 // Function body here
}