Pure JS

Question 1

A primitive data type that represents the absence of a value.

Answer 1

null

Question 2

A primitive data type that is the value of a variable or object that has not been initialized, or of a function that returns no value.

Answer 2

undefined

Question 3

A block of JavaScript code that you define once, and can invoke over and over again.

Answer 3

Function

Question 4

A function defined in an object

Answer 4

Method

Question 5

Name the all the Primitive Types

Answer 5

Numbers, Strings, Booleans, Null, and Undefined

Question 6

Name the Object Types

Answer 6

Arrays, Functions, and Objects

Question 7

Functions that are written to be used (with the new operator) to initialize a newly created object.

Answer 7

Constructor

Question 8

Any JavaScript type that can be changed, like objects and arrays.

Answer 8

Mutable Type

Question 9

Any JavaScript type that cannot be changed, like numbers, strings, booleans, null, undefined.

Answer 9

Immutable Type

Question 10

Variables declared inside a function have function scope and are visible only to code that appears inside that function.

Answer 10

Local Scope

Question 11

A global primitive number that represents when something is not a number

Answer 11

NaN

Question 12

Values that evaluate to boolean true or false but that aren’t actually boolean values of true or false.

Answer 12

Truthy or Falsey

Question 13

Truthy Examples

Answer 13

Everything that is not “Falsey”

Question 14

Falsey Examples

Answer 14

false, 0, “” (empty string), null, undefined, NaN

Question 15

Boolean Comparison Operators

Answer 15

&& (and), || (or), ! (not)

Question 16

Globally defined symbols that are available to a JavaScript program like undefined, Infinity, NaN, isNaN(), parseInt(), eval(), Date(), RegExp(), String()

Answer 16

Global Object/Global Function

Question 17

Literal

Answer 17

A data value that appears directly in a program

Question 18

What is an Immediately-Invoked Function Expression?

Answer 18

(function(){ // …do something… })();

Question 19

What is a Closure?

Answer 19

A function that returns another function. It makes it possible for a function to have “private” variables.

Question 20

Function Declaration

Answer 20

function doSomething(){ // …do something… };

Question 21

Function Expression

Answer 21

var doSomething = function(){ // …do something… };

Question 22

Boolean

Answer 22

Something with the value of True or False

Question 23

Statement

Answer 23

var statement = “I am a statement”; console.log(“I am also a statement!”); myFunction(); // I am a statement too; Statements are the instructions of a computer program – they are executed by the computer and perform some action or computation.

Question 24

Fixed Values

Answer 24

Literals ex: Numbers, strings, expressions

Question 25

Variable Values

Answer 25

Variables are used to store data values for a later time. Ex: var myVariable = “literal string”;

Question 26

Reserved Words

Answer 26

words that have special meaning attached to them. There are dozens. a few examples are: break, for, if, null, etc…

Question 27

Comments

Answer 27

// This is a one-line comment /* This is a multiple line (or block) comment */

Question 28

camelCase

Answer 28

JS convention where you capitalize every new word besides the first. Ex: thisIsAnExampleOfCamelCase

Question 29

Equality Operators

Answer 29

=== or !==

Question 30

Comparison Operators

Answer 30

, >=, <=

Question 31

Order of Operations

Answer 31

(), !, &&, ||; // in that order

Question 32

Ternary Operator

Answer 32

variableToSet = (conditionToCheck) ? :

Question 33

== vs. ===

Answer 33

The difference is that === will also check to make sure the ‘type’ of the two operands are the same. Example: 0 == “0” // true 0 === “0” // false

Question 34

code that repeats the doing of a specific task one or more times based upon certain conditions

Answer 34

loop

Question 35

Types of loops

Answer 35

While, do, for

Question 36

While Loop

Answer 36

performs a task for an unknown number of iterations, but while a condition is true. Example: var num = 0; while(num <= 100){ console.log(num); num++; }

Question 37

Do Loop

Answer 37

same as while loop, but performs the task at least one time in spite of the conditions veracity. Example: var num = 105; do { console.log(num); num++; } while (num <= 100);

Question 38

For loop

Answer 38

performs a task for a specified number of iterations. Example: var echo = “hello…”; for (var i = 0; i >= 0; i++){ console.log(echo); }

Question 39

Break

Answer 39

Reserved keyword that ends a loop early. Example: var count = 0; while (true) { console.log(count); count++; if (count > 10) break; // exit the loop }

Question 40

IIFE

Answer 40

Immediately-invoked Function Expression

Question 41

null

Answer 41

A primitive data type that represents the absence of a value.

Question 42

undefined

Answer 42

A primitive data type that is the value of a variable or object that has not been initialized, or of a function that returns no value.

Question 43

Function

Answer 43

A block of JavaScript code that you define once, and can invoke over and over again.

Question 44

Method

Answer 44

A function defined in an object

Question 45

Numbers, Strings, Booleans, Null, and Undefined

Answer 45

Name the all the Primitive Types

Question 46

Arrays, Functions, and Objects

Answer 46

Name the Object Types

Question 47

Constructor

Answer 47

Functions that are written to be used (with the new operator) to initialize a newly created object.

Question 48

Mutable Type

Answer 48

Any JavaScript type that can be changed, like objects and arrays.

Question 49

Immutable Type

Answer 49

Any JavaScript type that cannot be changed, like numbers, strings, booleans, null, undefined.

Question 50

Local Scope

Answer 50

Variables declared inside a function have function scope and are visible only to code that appears inside that function.

Question 51

NaN

Answer 51

A global primitive number that represents when something is not a number

Question 52

Truthy or Falsey

Answer 52

Values that evaluate to boolean true or false but that aren’t actually boolean values of true or false.

Question 53

Everything that is not “Falsey”

Answer 53

Truthy Examples

Question 54

false, 0, “” (empty string), null, undefined, NaN

Answer 54

Falsey Examples

Question 55

&& (and), || (or), ! (not)

Answer 55

Boolean Comparison Operators

Question 56

Global Object/Global Function

Answer 56

Globally defined symbols that are available to a JavaScript program like undefined, Infinity, NaN, isNaN(), parseInt(), eval(), Date(), RegExp(), String()

Question 57

A data value that appears directly in a program

Answer 57

Literal

Question 58

(function(){ // …do something… })();

Answer 58

What is an Immediately-Invoked Function Expression?

Question 59

A function that returns another function. It makes it possible for a function to have “private” variables.

Answer 59

What is a Closure?

Question 60

function doSomething(){ // …do something… };

Answer 60

Function Declaration

Question 61

var doSomething = function(){ // …do something… };

Answer 61

Function Expression

Question 62

Something with the value of True or False

Answer 62

Boolean

Question 63

var statement = “I am a statement”; console.log(“I am also a statement!”); myFunction(); // I am a statement too; Statements are the instructions of a computer program – they are executed by the computer and perform some action or computation.

Answer 63

Statement

Question 64

Literals ex: Numbers, strings, expressions

Answer 64

Fixed Values

Question 65

Variables are used to store data values for a later time. Ex: var myVariable = “literal string”;

Answer 65

Variable Values

Question 66

words that have special meaning attached to them. There are dozens. a few examples are: break, for, if, null, etc…

Answer 66

Reserved Words

Question 67

// This is a one-line comment /* This is a multiple line (or block) comment */

Answer 67

Comments

Question 68

JS convention where you capitalize every new word besides the first. Ex: thisIsAnExampleOfCamelCase

Answer 68

camelCase

Question 69

=== or !==

Answer 69

Equality Operators

Question 70

, >=, <=

Answer 70

Comparison Operators

Question 71

(), !, &&, ||; // in that order

Answer 71

Order of Operations

Question 72

variableToSet = (conditionToCheck) ? :

Answer 72

Ternary Operator

Question 73

The difference is that === will also check to make sure the ‘type’ of the two operands are the same. Example: 0 == “0” // true 0 === “0” // false

Answer 73

== vs. ===

Question 74

loop

Answer 74

code that repeats the doing of a specific task one or more times based upon certain conditions

Question 75

While, do, for

Answer 75

Types of loops

Question 76

performs a task for an unknown number of iterations, but while a condition is true. Example: var num = 0; while(num <= 100){ console.log(num); num++; }

Answer 76

While Loop

Question 77

same as while loop, but performs the task at least one time in spite of the conditions veracity. Example: var num = 105; do { console.log(num); num++; } while (num <= 100);

Answer 77

Do Loop

Question 78

performs a task for a specified number of iterations. Example: var echo = “hello…”; for (var i = 0; i >= 0; i++){ console.log(echo); }

Answer 78

For loop

Question 79

Reserved keyword that ends a loop early. Example: var count = 0; while (true) { console.log(count); count++; if (count > 10) break; // exit the loop }

Answer 79

Break

Question 80

Immediately-invoked Function Expression

Answer 80

IIFE