Javascript Overview and Syntax Flashcards
Why is placing script in the bottom good?
It improves the performance because the download and execution of the script blocks the page’s rendering
True or false:
”/* pluhhh
pluh pluh
pluh*/”
Is that a multi-line comment?
True
True or False: Variables “pluhPluh” and “Pluhpluh” are considered the same variable
False
Does this follow proper coding conventions: pluhPluh = pluhPluh + 1
It does follow proper coding conventions
What is console.log()
It can be used to output the message
What is the initial name of JS?
Livescript
True or False: You should not end statements with a semicolon
False
What are the pros and cons of external script?
Pros:
The use of external script file can be applied to other websites, unlike the embedded script.
Cons:
It can lower the performance of the website
Where does the symbol for single line comments used at?
It is used at the beginning of the line
Where is the script usually placed?
The end of the document / right before the </body> tag
How to use Javascript for website programs?
<script> </script>
What is an external script?
What is document.write()
It is used to write the content to the current document only while the document is being parsed.
What are the common rules of syntax?
- Case-sensitivity
- White/empty space would be ignored
- Naming Variables should be “camelCase”
- Avoid lines longer than 80 characters for readability
- Put spaces around operators for easier interpretations
What is an embedded script?
<script> Your code here </script>
True or False: Data on Javascript is typed loosely
True
What symbols do the single line comments use?
//
Does the variable “pluhPluh” follow the rules of naming variables?
yes
What is the difference between console.log() and document.write()
console.log() types it in the output console, but the document.write() outputs it in the main document (like the page where you see html and css stuff)
