This question already has answers here:
What does the "|" (single pipe) do in JavaScript?
(5 answers)
What is this asm style "x | 0" some javascript programmers are now using?
(4 answers)
Closed 7 years ago.
I have been looking into asm.js to use for a project recently, and I noticed that very often the asm.js compiled code will end a statement with |0;, even seemingly redundantly as in the statement i = i|0;
This is not something I have encountered in Javascript code before. What is it for?
EDIT
I don't believe this is duplicate. I know what a bitwise or is. I am specifically asking here why one might use it to or with a 0 before assignment. What purpose does that serve?
Convert to integer and apply a bitwise or with 0. Basically a short form of Math.floor().
Related
This question already has answers here:
What does this symbol mean in JavaScript?
(1 answer)
What do these JavaScript bitwise operators do?
(3 answers)
Closed 27 days ago.
What is the difference between a Right Shift assignment and unsigned Right Shift assignment?
I visited some sites like MWD w3school and etc but I could notice that. also, check the answers in the stack overflow but in want to know to compare these symbols.
This question already has answers here:
Using explicitly numbered repetition instead of question mark, star and plus
(4 answers)
Reference - What does this regex mean?
(1 answer)
Closed 4 years ago.
Is there any difference between the regular expressions:-
/^[1-9][0-9]+$/
and
/^[1-9]{1}[0-9]+$/
They both seem to give the same result. Which convention is better,because in many examples I can see the use of {1}, but feel it is quite useless, am I right?
This question already has answers here:
What are the rules for JavaScript's automatic semicolon insertion (ASI)?
(7 answers)
Why do results vary based on curly brace placement?
(6 answers)
Closed 4 years ago.
In most cases, we can omit semi colon at the end of a statement. But there is a exception I can tell.
isGreenBottleFull && clearGreenBottle()
isRedBottleFull && clearRedBottle()
If you omit the semi colons, the behavior will be strange.
My question is that is there any other cases in which the semi colon is required?
Semicolons in JavaScript are rarely required for code to execute properly, however are considered a best practice for code quality.
I would recommend this reference as a guide:
https://www.codecademy.com/en/forum_questions/507f6dd09266b70200000d7e
This question already has answers here:
Simplest code for array intersection in javascript
(40 answers)
Closed 9 years ago.
This is my ruby code.
array1= [1,2,3,4,5]
array2= [2,3,4,5,6]
if (array1 & array2).size == 4
puts "4 match"
How can I write the same thing in javascript? Is there any material like ruby-doc in javascript?
There isn't a native method do do it.
Have a look at here : Simplest code for array intersection in javascript
The best documentation I know about javascript and html5 is the Mozilla developer network.
This question already has answers here:
Closed 12 years ago.
Possible Duplicate:
Why split the <script> tag when writing it with document.write()?
I don't really do Javascript programming and was hard to google this but have seen something like this in a couple of different places (by good developers):
document.writeln('<scr'+'ipt src="'+pcheck+'" type="text/javascript"></scr'+'ipt>');
With the split always between the r and the i. What does this achieve?
This is to prevent any script blockers from loading this script, because they cannot find the "script" word within the text.