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What does “fragment” mean in ANTLR?
...is somewhat akin to an inline function: It makes the grammar more readable and easier to maintain.
A fragment will never be counted as a token, it only serves to simplify a grammar.
Consider:
NUMBER: DIGITS | OCTAL_DIGITS | HEX_DIGITS;
fragment DIGITS: '1'..'9' '0'..'9'*;
fragment OCTAL_DIGITS: '...
How to initialise memory with new operator in C++?
I'm just beginning to get into C++ and I want to pick up some good habits. If I have just allocated an array of type int with the new operator, how can I initialise them all to 0 without looping through them all myself? Should I just use memset ? Is there a “C++” way to do it?
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ERROR 2003 (HY000): Can't connect to MySQL server on '127.0.0.1' (111)
I use the following command:
15 Answers
15
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Drawing a dot on HTML5 canvas [duplicate]
... on the HTML5 canvas is quite straightforward using the context.moveTo() and context.lineTo() functions.
6 Answers
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How do I print a double value without scientific notation using Java?
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but it showed dexp: 12345681.000000 which is wrong value.And actually after then I want to display it on my web page where it display like this 1.2345678E7.Is there anyway through which i can store it in any double like 12345678 and any other way?
– Despicabl...
What does `void 0` mean? [duplicate]
...t does void 0 mean?
void[MDN] is a prefix keyword that takes one argument and always returns undefined.
Examples
void 0
void (0)
void "hello"
void (new Date())
//all will return undefined
What's the point of that?
It seems pretty useless, doesn't it? If it always returns undefined, what's wron...
Calling a Method From a String With the Method's Name in Ruby
... module function
FileUtils.send('pwd')
# or
FileUtils.public_send(:pwd)
and a locally defined method
def load()
puts "load() function was executed."
end
send('load')
# or
public_send('load')
Documentation:
Object#public_send
Object#send
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Advances social tools app with cool UI - Koded Apps - Kodular Community
... "regular" scheme is dark */
/* user picked a theme a light scheme and also enabled a dark scheme */
/* deal with light scheme first */
@media (prefers-color-scheme: light) {
:root {
--primary: #000000;
--secondary: #ffffff;
--te...
Ruby, remove last N characters from a string?
... 2.5 you can use delete_suffix or delete_suffix! to achieve this in a fast and readable manner.
The docs on the methods are here.
If you know what the suffix is, this is idiomatic (and I'd argue, even more readable than other answers here):
'abc123'.delete_suffix('123') # => "abc"
'abc123'...
Regular expression for first and last name
For website validation purposes, I need first name and last name validation.
23 Answers
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