大约有 41,300 项符合查询结果（耗时：0.0396秒） [XML]
JavaScript closure inside loops – simple practical example
...lock-scoping post as a great source of information.
for (let i = 0; i < 3; i++) {
funcs[i] = function() {
console.log("My value: " + i);
};
}
Beware, though, that IE9-IE11 and Edge prior to Edge 14 support let but get the above wrong (they don't create a new i each time, so all the funct...
How do you know when to use fold-left and when to use fold-right?
... you use a left fold. Example (haskell-style pseudocode)
foldl (-) [1, 2, 3] == (1 - 2) - 3 == 1 - 2 - 3 // - is left-associative
If your operator is right-associative (right fold), the parentheses would be set like this:
A x (B x (C x D))
Example: Cons-Operator
foldr (:) [] [1, 2, 3] == 1 : ...
jQuery .data() does not work, but .attr() does
...
213
I ran into a similar "bug" a few days ago when working with .data() and .attr('data-name') for H...
Bootstrap 3 - Why is row class is wider than its container?
I just started using Bootstrap 3. I am having a difficult time
understanding how the row class works.
Is there a way to avoid the padding-left and padding-right ?
...
Callback functions in C++
...pe.
X.2 "Calling" a callback refers to the syntax to call those objects.
X.3 "Using" a callback means the syntax when passing arguments to a function using a callback.
Note: As of C++17, a call like f(...) can be written as std::invoke(f, ...) which also handles the pointer to member case.
1. Fun...
Passing an array to a function with variable number of args in Swift
...
answered Jun 3 '14 at 20:53
manojldsmanojlds
248k5454 gold badges425425 silver badges395395 bronze badges
...
Converting a list to a set changes element order
...
113
A set is an unordered data structure, so it does not preserve the insertion order.
This depends...
Comparing strings with == which are declared final in Java
...
232
When you declare a String (which is immutable) variable as final, and initialize it with a comp...
How to overcome TypeError: unhashable type: 'list'
...else:
d[key] = [value]
print d
# {'AAA': ['111', '112'], 'AAC': ['123'], 'AAB': ['111']}
Note that if you are using Python 3.x, you'll have to make a minor adjustment to get it work properly. If you open the file with rb, you'll need to use line = line.split(b'x') (which makes sure you are ...
What does the “at” (@) symbol do in Python?
...
331
An @ symbol at the beginning of a line is used for class, function and method decorators.
Rea...