NYC Codecademy Group - JavaScript Quiz

1. Var numbers = [1, 2, 3] is an example of:

Array

Function

Object

Method

An array is a special variable which can hold more than one value at a time.
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Explanation

An array is a special variable which can hold more than one value at a time.
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2. If (name.length > 0) { console.log("Please enter your name."); } else { console.log("Hello " + name); } is an example of:

If Statement

If...Else Statement

Else If Statement

Switch Statement

If the condition (name.length>0) is true, statement1 will be executed. Otherwise, statement2 will be executed.

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Explanation

If the condition (name.length>0) is true, statement1 will be executed. Otherwise, statement2 will be executed.

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3. Switch (GPA){ case 90: letterGrade = "A+"; break; case 80: letterGrade = "A"; break; case 70: letterGrade = "C"; break; case 60: letterGrade = "D"; break; case 50: letterGrade = "E"; break; default: letterGrade = "F"; break; }

If...Else Statement

Ternary Operator

Else If Statement

Switch Statement

Switch statements are a shorthand way to write if else statements when there are many different cases, and each case has a different outcome.

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Explanation

Switch statements are a shorthand way to write if else statements when there are many different cases, and each case has a different outcome.

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4. I++

Incrementor

Operator

Iterator

Decrementor

Incrementors/Decrementors are used to increase/reduce the value of a variable by 1
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Explanation

Incrementors/Decrementors are used to increase/reduce the value of a variable by 1
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5. Var i; for (i = 0; i < 2; i++) { console.log("i is now equal to " + i);

Function

Object

For Loop

While Loop

In JavaScript, there are two different kind of loops:
for - loops through a block of code a specified number of times
while - loops through a block of code while a specified condition is true
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Explanation

In JavaScript, there are two different kind of loops:
for - loops through a block of code a specified number of times
while - loops through a block of code while a specified condition is true
See Codecademy lesson

6. Var i = 0; while ( i < 2 ) { console.log( "i is now " + i ); i++; }

While Loop

Incrementor

For Loop

Function

In JavaScript, there are two different kind of loops:

for - loops through a block of code a specified number of times

while - loops through a block of code while a specified condition is true

See Codecademy lesson

Explanation

In JavaScript, there are two different kind of loops:

for - loops through a block of code a specified number of times

while - loops through a block of code while a specified condition is true

See Codecademy lesson

7. In the function below, what does the text '(w, l)' represent? var area = function (w, l) { return w * l; };

Variables

Parameters

Strings

Object

A parameter is a variable that is processed by the function to generate a given result. In this case, if we run the function as follows: area(2,3); we will get a result of 6. To further clarify, parameters are the variables in the declaration of a function (w,l) while arguments are the specific values that get passed when running the function (2,3)

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Explanation

A parameter is a variable that is processed by the function to generate a given result. In this case, if we run the function as follows: area(2,3); we will get a result of 6. To further clarify, parameters are the variables in the declaration of a function (w,l) while arguments are the specific values that get passed when running the function (2,3)

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8. Var = myName is an example of a

Variable

String

Object

Method

variables are used to hold values or expressions

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Explanation

variables are used to hold values or expressions

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9. Is an example of a:

Method

Variable

Object

Function

A function contains code that will be executed by an event or by a call to the function. In this case, we would call the function by writing a command: hello(); which would display the text "i am saying hello" in the console.

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Explanation

A function contains code that will be executed by an event or by a call to the function. In this case, we would call the function by writing a command: hello(); which would display the text "i am saying hello" in the console.

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10. Is an example of a

Method

Object

Function

Variable

A function contains code that will be executed by an event or by a call to the function.

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Explanation

A function contains code that will be executed by an event or by a call to the function.

See Codecademy lesson:

11. Var dogName = dog.name

is an example of accessing an object's property using:

Dot Notation

Bracket Notation

Object Literal Notation

Object Constructor Notation

When you access a property, you are setting a variable equal to the the value of a property in a particular object.

In this example, we are setting variable dogName equal to the value of the 'name' property of the 'dog' object.

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Explanation

When you access a property, you are setting a variable equal to the the value of a property in a particular object.

In this example, we are setting variable dogName equal to the value of the 'name' property of the 'dog' object.

See Codecademy lesson

12. For the object below, what does the word 'name' represent?

var dog = {name: "Daisy", age: 6};

Property

Variable

Value

String

In this object, 'name' is a property. A property is a type of information that describes the object and is always paired with a value.

Objects can written in two different ways, depending on how the properties are defined within them:

1. Object Literal Notation:

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨normal¨»var«/mi»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dog«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mo»{«/mo»«mi mathvariant=¨normal¨»name«/mi»«mo»:«/mo»«mo»§quot;«/mo»«mi mathvariant=¨normal¨»Daisy«/mi»«mo»§quot;«/mo»«mo»,«/mo»«mi mathvariant=¨normal¨»age«/mi»«mo»:«/mo»«mn»6«/mn»«mo»)«/mo»«mo»;«/mo»«/math»

2. Object Constructor Notation

In addition to representing properties in two different ways when creating an object, you can also access properties two different ways:

1. Dot Notation

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨normal¨»var«/mi»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dogName«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dog«/mi»«mo».«/mo»«mi mathvariant=¨normal¨»name«/mi»«/math»

2. Bracket Notation:

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨normal¨»var«/mi»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dogName«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dog«/mi»«mo»[«/mo»«mo»§quot;«/mo»«mi mathvariant=¨normal¨»name«/mi»«mo»§quot;«/mo»«mo»]«/mo»«/math»

See Codecademy lesson

Explanation

In this object, 'name' is a property. A property is a type of information that describes the object and is always paired with a value.

Objects can written in two different ways, depending on how the properties are defined within them:

1. Object Literal Notation:

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨normal¨»var«/mi»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dog«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mo»{«/mo»«mi mathvariant=¨normal¨»name«/mi»«mo»:«/mo»«mo»§quot;«/mo»«mi mathvariant=¨normal¨»Daisy«/mi»«mo»§quot;«/mo»«mo»,«/mo»«mi mathvariant=¨normal¨»age«/mi»«mo»:«/mo»«mn»6«/mn»«mo»)«/mo»«mo»;«/mo»«/math»

2. Object Constructor Notation

In addition to representing properties in two different ways when creating an object, you can also access properties two different ways:

1. Dot Notation

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨normal¨»var«/mi»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dogName«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dog«/mi»«mo».«/mo»«mi mathvariant=¨normal¨»name«/mi»«/math»

2. Bracket Notation:

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨normal¨»var«/mi»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dogName«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dog«/mi»«mo»[«/mo»«mo»§quot;«/mo»«mi mathvariant=¨normal¨»name«/mi»«mo»§quot;«/mo»«mo»]«/mo»«/math»

See Codecademy lesson

13. Is an example of accessing an object's property using:

Object Literal Notation

Bracket Notation

Dot Notation

Object Literal Notation

When you access a property, you are setting a variable equal to the the value of a property in a particular object.

In this example, we are setting variable dogName equal to the value of the 'name' property of the 'dog' object.

See Codecademy lesson

Explanation

When you access a property, you are setting a variable equal to the the value of a property in a particular object.

In this example, we are setting variable dogName equal to the value of the 'name' property of the 'dog' object.

See Codecademy lesson

14. Select which of the options below are data types

Number

String

Function

Boolean

The three data types are number, string and Boolean.

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Explanation

The three data types are number, string and Boolean.

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Submit

15. Is an example of

If statement

If...Else Statement

Switch Statement

Ternary Operator

Ternary operators are a shorthand way of writing if else statements.

See Codecademy lesson

Explanation

Ternary operators are a shorthand way of writing if else statements.

See Codecademy lesson

16. Is an example of creating an object using:

Dot Notation

Object Literal Notation

Bracket Notation

Object Constructor Notation

Objects can written in two different ways, depending on how the properties are defined within them:

1. Object Literal Notation:

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨normal¨»var«/mi»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dog«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mo»{«/mo»«mi mathvariant=¨normal¨»name«/mi»«mo»:«/mo»«mo»§quot;«/mo»«mi mathvariant=¨normal¨»Daisy«/mi»«mo»§quot;«/mo»«mo»,«/mo»«mi mathvariant=¨normal¨»age«/mi»«mo»:«/mo»«mn»6«/mn»«mo»)«/mo»«mo»;«/mo»«/math»

2. Object Constructor Notation

In addition to representing properties in two different ways when creating an object, you can also access properties two different ways:

1. Dot Notation

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨normal¨»var«/mi»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dogName«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dog«/mi»«mo».«/mo»«mi mathvariant=¨normal¨»name«/mi»«/math»

2. Bracket Notation:

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨normal¨»var«/mi»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dogName«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dog«/mi»«mo»[«/mo»«mo»§quot;«/mo»«mi mathvariant=¨normal¨»name«/mi»«mo»§quot;«/mo»«mo»]«/mo»«/math»

See Codecademy lesson

Explanation

Objects can written in two different ways, depending on how the properties are defined within them:

1. Object Literal Notation:

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨normal¨»var«/mi»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dog«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mo»{«/mo»«mi mathvariant=¨normal¨»name«/mi»«mo»:«/mo»«mo»§quot;«/mo»«mi mathvariant=¨normal¨»Daisy«/mi»«mo»§quot;«/mo»«mo»,«/mo»«mi mathvariant=¨normal¨»age«/mi»«mo»:«/mo»«mn»6«/mn»«mo»)«/mo»«mo»;«/mo»«/math»

2. Object Constructor Notation

In addition to representing properties in two different ways when creating an object, you can also access properties two different ways:

1. Dot Notation

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨normal¨»var«/mi»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dogName«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dog«/mi»«mo».«/mo»«mi mathvariant=¨normal¨»name«/mi»«/math»

2. Bracket Notation:

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨normal¨»var«/mi»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dogName«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dog«/mi»«mo»[«/mo»«mo»§quot;«/mo»«mi mathvariant=¨normal¨»name«/mi»«mo»§quot;«/mo»«mo»]«/mo»«/math»

See Codecademy lesson

17. Var dog = (); dog.name = "Daisy"; dog.age = 6;

is an example of creating an object using:

Object Literal Notation

Object Constructor Notation

Dot Notation

Bracket Notation

Objects can written in two different ways, depending on how the properties are defined within them:

1. Object Literal Notation:

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨normal¨»var«/mi»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dog«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mo»{«/mo»«mi mathvariant=¨normal¨»name«/mi»«mo»:«/mo»«mo»§quot;«/mo»«mi mathvariant=¨normal¨»Daisy«/mi»«mo»§quot;«/mo»«mo»,«/mo»«mi mathvariant=¨normal¨»age«/mi»«mo»:«/mo»«mn»6«/mn»«mo»)«/mo»«mo»;«/mo»«/math»

2. Object Constructor Notation

In addition to representing properties in two different ways when creating an object, you can also access properties two different ways:

1. Dot Notation

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨normal¨»var«/mi»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dogName«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dog«/mi»«mo».«/mo»«mi mathvariant=¨normal¨»name«/mi»«/math»

2. Bracket Notation:

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨normal¨»var«/mi»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dogName«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dog«/mi»«mo»[«/mo»«mo»§quot;«/mo»«mi mathvariant=¨normal¨»name«/mi»«mo»§quot;«/mo»«mo»]«/mo»«/math»

See Codecademy lesson

Explanation

Objects can written in two different ways, depending on how the properties are defined within them:

1. Object Literal Notation:

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨normal¨»var«/mi»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dog«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mo»{«/mo»«mi mathvariant=¨normal¨»name«/mi»«mo»:«/mo»«mo»§quot;«/mo»«mi mathvariant=¨normal¨»Daisy«/mi»«mo»§quot;«/mo»«mo»,«/mo»«mi mathvariant=¨normal¨»age«/mi»«mo»:«/mo»«mn»6«/mn»«mo»)«/mo»«mo»;«/mo»«/math»

2. Object Constructor Notation

In addition to representing properties in two different ways when creating an object, you can also access properties two different ways:

1. Dot Notation

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨normal¨»var«/mi»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dogName«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dog«/mi»«mo».«/mo»«mi mathvariant=¨normal¨»name«/mi»«/math»

2. Bracket Notation:

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨normal¨»var«/mi»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dogName«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mi mathvariant=¨normal¨»dog«/mi»«mo»[«/mo»«mo»§quot;«/mo»«mi mathvariant=¨normal¨»name«/mi»«mo»§quot;«/mo»«mo»]«/mo»«/math»

See Codecademy lesson