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Sem2 Web > Week 5 > Flashcards

Week 5 Flashcards

1
Q

When JavaScript manipulates a page or responds to user actions, what is it called?

A

Event Handling

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2
Q

JavaScript can…

Dynamically update _______ (CKE)
Manipulate ____ and ___
Manipulate and validate ____

A

Content, HTML and CSS, Data

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3
Q

As a developer

JavaScript cannot…

A

Write data permanently to an existing file
Access files on the server
Get data from the server database
Handle file uploads

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4
Q

JavaScript was introduced by NetScape in ____
JavaScripts biggest update was in 2015 when ___ was released, the ___ version

A

1996, ES6, 6th

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5
Q

Is JavaScript interpreted or compiled?

A

Interpreted

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6
Q

JavaScript’s key construct is the ________

A

function

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7
Q

3 ways to add JavaScript to an HTML page. Which way is recommended?

A

Embed, Inline, Link

Link is recommended

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8
Q

T/F - To embed a script with JavaScript, just add the code as part of a script element

A

True

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9
Q

To link a JavaScript file, just like a CSS file, where does the link go?

A

In the HTML pages head

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10
Q

<!DOCTYPE html>

<html>
<head>



</head>
<body>
<button> Click Me! </button>
</body>
</html>
Will myFunction() link to the JavaScript function?



















A



















Yes















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11










Q













How do comments in JavaScript compare to Java?

















A



















They are identical















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12










Q













alert()

















A



















Display content with a pop up box















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13










Q













prompt()

















A



















DIsplays a message and an input field within a modal window















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14










Q













confirm()

















A



















Displays a question in a modal window with ok and cancel buttons















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15










Q













console.log

















A



















Display content in the browsers JavaScript console















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16










Q













document.write()


















A













outputs the content (as markup or code) directly to the HTML document















17










Q













What does markup mean?


















A













Markup is the series of characters, symbols, and language that organizes and defines how the content looks, It is the code.















18










Q













T/F - Each browsers console tab includes a text that you can use to enter your expressions or statements


















A













True















19










Q













T/F - You can execute multiple statements in the console by separating each statement with a  semicolon


















A













True















20










Q













3 ways  JavaScript code executes:


















A













    

  1. Auto, when the page loads
    2. 

  2. When your script calls a function
    3. 

  3. In response to some event, such as the user clicking a button
    4. 
















21










Q













JavaScript variables are dynamically _____, declared with the ___ or ___ keyword and are ____ _________


















A













typed, let or var keyword, case senstiive















22










Q













What does typeof do in JavaScript?


















A













Figures out a given variables type















23










Q













What is the default value and type of a declared but uninitialized varaible?


















A













Undefined and undefined.















24










Q













Do we use camelCasing for JavaScript?


















A













yes















25










Q













T/F - In JavaScript, a variable can be declared after it has been used


















A













True, it’s called hoisting















26










Q













Explain hoisting in JavaScript


















A













It’s JS’s default behavior of moving declarataions to the top















27










Q















Explain the difference between “var” and “let” during these 3 scenarios


Scope


Re-declaration


Hoisting




















A













Scope
* var declarations are function-scoped.
* let variables are block-scoped.
Re-declaration
* var variables can be updated and re-declared within the scope.
* let variables can be updated but not re-declared.
Hoisting
* var variables are hoisted with an initial value undefined.
* let variables are not hoisted with an initial value















28










Q













In JavaScript the “numbers” datatype represents ________ and ________-_____ numbers


















A













integers and floating point















29










Q













An “object” in JavaScript includes ________ and ______


















A













functions and arrays















30










Q













T/F - In JavaScript, strings can only be double quotes


















A













False, they can be both double and single quotes















31










Q













What happens in each of these variable cases?
1. let a = “10”; let b = 20; console.log(a+b)
2. let a = “10”; let b = 20; console.log(+a+b)
3. let a = “10”; let b = 10; console.log(a-b)
4. let a = “10”; let b = true; console.log(a-b)
5. let a = “hello”; let b = “world”; console.log(a-b)


















A













    

  1. 1020
    2. 

  2. 30 - the 10 gets converted to a int the by unary operator (+)
    3. 

  3. 0 (converted to int by the -)
    4. 

  4. 9 (true = 1 when converted)
    5. 

  5. NaN
    6. 
















32










Q















Name the string PROPERTY that can be used to see how long a string is


stringName.




















A













stringName.length















33










Q













When using the Boolean() function, what are the values that will return false? what will return true?


















A













False: 0, 0.0, NaN, empty string “”, null, and undefined
True: anything else















34










Q













JavaScript operators: +, -, /, *,… 3 more


















A













% modulo division
++ increment
– decrement















35










Q













JavaScript Assignment Operators:
a += b
a *= b
a %= b
What do these do?


















A













a = a+b
a = a*b
a = a%b















36










Q













T/F - else-if behaves the same way as if-else in Java


















A













True















37










Q













All loops in JavaScript must consist of 3 things, what are they?


















A













Incrementor
Conditional expression
Logic to increase the incrementor






























Sem2 Web (19 decks)


























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