大约有 7,000 项符合查询结果（耗时：0.0351秒） [XML]
remove all variables except functions
... env))
}
obj.type <- function(x) class(get(x, envir = env))
foo <- sapply(ls(envir = env), obj.type)
object.name <- names(foo)
names(foo) <- seq(length(foo))
dd <- data.frame(CLASS = foo, OBJECT = object.name,
stringsAsFactors = FALSE)
...
Test for existence of nested JavaScript object key
...vel1', 'level2', 'level3'); // true
checkNested(test, 'level1', 'level2', 'foo'); // false
ES6 UPDATE:
Here is a shorter version of the original function, using ES6 features and recursion (it's also in proper tail call form):
function checkNested(obj, level, ...rest) {
if (obj === undefined) ...
Using logging in multiple modules
...E.g.
#my_module
import logging
logger = logging.getLogger(__name__)
def foo():
logger.info('Hi, foo')
class Bar(object):
def bar(self):
logger.info('Hi, bar')
And in your main module :
#main
import logging
# load my module - this now configures the logger
import my_module
# ...
How to sort Map values by key in Java?
...he demonstration, but doesn't have to be a lambda expression
Comparator<Foo> comparator = (Foo o1, Foo o2) -> {
...
}
SortedSet<Foo> keys = new TreeSet<>(comparator);
keys.addAll(map.keySet());
Remember when using a TreeMap or TreeSet that it will have different p...
How to create an alias for a command in Vim?
...cted result depending on the actual buffer content and VIM settings: :%s/W/foo/g<CR> :%s/w/foo/g<CR>
– cprn
Apr 25 '12 at 2:00
...
Using Chrome, how to find to which events are bound to an element
...ID should take you to the binding function eventually.
Ex: searching for #foo would take you to
$('#foo').click(function(){ alert('bar'); })
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...
Is it possible to data-bind visible to the negation (“!”) of a boolean ViewModel property?
...not = ko.computed(function () {
return !target();
});
};
self.foo = ko.observable(true).extend({ not: null });
<div data-bind="text: foo"></div> <!-- true -->
<div data-bind="text: foo.not"></div> <!-- false -->
<!-- unfortunately I can't thi...
Executing an EXE file using a PowerShell script
...and that has a space in its path like so:
& "c:\some path with spaces\foo.exe" <arguments go here>
That is & expects to be followed by a string that identifies a command: cmdlet, function, native exe relative or absolute path.
Once you get just this working:
& "c:\some path wi...
Multiline Comment Workarounds?
...i_idea isn't really there...
print( api_idea )
`)
####
#### Code. ####
foo <- function() {
print( "The above did not evaluate!")
}
foo()
[Original Answer]
Here's another way... check out the pic at the bottom. Cut and paste the code block into RStudio.
Multiline comments that make u...
How do I get SUM function in MySQL to return '0' if no values are found?
...one with a mixture):
SQL Fiddle
MySQL 5.5.32 Schema Setup:
CREATE TABLE foo
(
id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
val INT
);
INSERT INTO foo (val) VALUES
(null),(1),(null),(2),(null),(3),(null),(4),(null),(5),(null),(6),(null);
CREATE TABLE bar
(
id INT NOT NULL AUTO_INCRE...