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.
Related
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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 is JavaScript's highest integer value that a number can go to without losing precision?
(21 answers)
Large numbers erroneously rounded in JavaScript
(6 answers)
Closed 5 years ago.
In javascript, why
console.log(99999999999999999)
results to
100000000000000000
TIA
Because your number is too large for javascript.
See here the Number.MAX_SAFE_INTEGER constant
Javascript can't handle number over 2^53 - 1 without rounding errors
see
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/MAX_SAFE_INTEGER
I suggest you use Strings for big numbers
This question already has answers here:
How to deal with floating point number precision in JavaScript?
(47 answers)
Is floating point math broken?
(31 answers)
Closed 5 years ago.
I'm trying to run the following calculation in JavaScript, 78.98 * 10 and the result returned is always 789.8000000000001 My question is where did that 0.0000000000001 come from?
I tried on several calculators, and that 0.0000000000001 should not be there. I did inclusive tests in other programming languages.
My question is, is there a logical explanation for this? If it is an error in the JavaScript engine where I notify?
Thank you.
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().
This question already has answers here:
Negative lookbehind equivalent in JavaScript
(11 answers)
Closed 7 years ago.
I've seen a few answers that deal with this question but was unable to get them to work.
What is a regex that would match "LOGGED_IN" but not match "NOT_LOGGED_IN"?
^LOGGED_IN$ is first to come to mind