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What is the id( ) function used for?
...ory...
This example might help you understand the concept a little more.
foo = 1
bar = foo
baz = bar
fii = 1
print id(foo)
print id(bar)
print id(baz)
print id(fii)
> 1532352
> 1532352
> 1532352
> 1532352
These all point to the same location in memory, which is why their values are...
Bash empty array expansion with `set -u`
...rsion 4.4.19(1)-release (x86_64-pc-linux-gnu)
$ set -u
$ arr=()
$ echo "foo: '${arr[@]}'"
foo: ''
There is a conditional you can use inline to achieve what you want in older versions: Use ${arr[@]+"${arr[@]}"} instead of "${arr[@]}".
$ function args { perl -E'say 0+@ARGV; say "$_: $ARGV[$_]"...
How to fallback to local stylesheet (not script) if CDN fails
...is as follows:
1) Add a special rule to the end of your CSS file, like:
#foo { display: none !important; }
2) Add the corresponding div in your HTML:
<div id="foo"></div>
3) On document ready, check whether #foo is visible or not. If the stylesheet was loaded, it will not be visib...
Is it ok to use dashes in Python files when trying to import them?
...be valid variable names ("identifiers") -- that means if you have a module foo_bar, you can use it from within Python (print foo_bar). You wouldn't be able to do so with a weird name (print foo-bar -> syntax error).
share...
Getting the name of a child class in the parent class (static context)
... var_dump(get_class($this));
var_dump(get_class());
}
}
class foo extends bar {
}
new foo;
?>
The above example will output:
string(3) "foo"
string(3) "bar"
share
|
improve this...
How can I have a newline in a string in sh?
...lity, doing away with all the problems.
So to get a newline in a string:
FOO="hello
world"
BAR=$(printf "hello\nworld\n") # Alternative; note: final newline is deleted
printf '<%s>\n' "$FOO"
printf '<%s>\n' "$BAR"
There! No SYSV vs BSD echo madness, everything gets neatly printed and...
How to un-submodule a Git submodule?
...re about to merge into: ie. if your submodule in the main repository is in foo/, in the submodule, perform mkdir foo && git mv !(foo) foo && git commit.
– Chris Down
Oct 11 '13 at 7:27
...
cscope or ctags why choose one over the other? [closed]
...hod is defined or implemented. The second feature means that when you type foo. or foo->, and if foo is a structure, then a pop-up menu with field completion will be shown.
cscope also has the first feature - using set cscopetag - but not the last. However cscope additionally adds the ability to...
Why is there no logical xor in JavaScript?
...
there is... sort of:
if( foo ? !bar : bar ) {
...
}
or easier to read:
if( ( foo && !bar ) || ( !foo && bar ) ) {
...
}
why? dunno.
because javascript developers thought it would be unnecessary as it can be expressed by oth...
How to change the type of a field?
...omment below. Change the field bad from a number to a string in collection foo.
db.foo.find( { 'bad' : { $type : 1 } } ).forEach( function (x) {
x.bad = new String(x.bad); // convert field to string
db.foo.save(x);
});
...