大约有 12,000 项符合查询结果（耗时：0.0380秒） [XML]
TypeScript function overloading
...Script, you only have one implementation with multiple signatures.
class Foo {
myMethod(a: string);
myMethod(a: number);
myMethod(a: number, b: string);
myMethod(a: any, b?: string) {
alert(a.toString());
}
}
Only the three overloads are recognized by TypeScript as po...
Select all elements with “data-” attribute without using jQuery
...ct all DOM elements that have a certain data- attribute (let's say data-foo ). The elements may be different tag elements.
...
Should I use a class or dictionary?
...
@Ralf A class Foo is merely a type, like int and string. Do you store value in an integer type or variable foo of integer type? Subtle, but important semantic difference. In languages like C this distinction is not too relevant outside of ...
Why does (“foo” === new String(“foo”)) evaluate to false in JavaScript?
...
"foo" is a string primitive. (this concept does not exist in C# or Java)
new String("foo") is boxed string object.
The === operator behaves differently on primitives and objects.
When comparing primitives (of the same type)...
uppercase first character in a variable with bash
...
foo="$(tr '[:lower:]' '[:upper:]' <<< ${foo:0:1})${foo:1}"
share
|
improve this answer
|
...
Is Java “pass-by-reference” or “pass-by-value”?
...Dog = new Dog("Max");
Dog oldDog = aDog;
// we pass the object to foo
foo(aDog);
// aDog variable is still pointing to the "Max" dog when foo(...) returns
aDog.getName().equals("Max"); // true
aDog.getName().equals("Fifi"); // false
aDog == oldDog; // true
}
public stat...
How to sort an array in descending order in Ruby
...everse way will reverse the order of keys that are equal.
Example:
a = [{foo: 1, bar: 1},{foo: 2,bar: 1}]
a.sort_by {|h| -h[:bar]}
=> [{:foo=>1, :bar=>1}, {:foo=>2, :bar=>1}]
a.sort_by {|h| h[:bar]}.reverse
=> [{:foo=>2, :bar=>1}, {:foo=>1, :bar=>1}]
While you oft...
Java optional parameters
... ways to simulate optional parameters in Java:
Method overloading.
void foo(String a, Integer b) {
//...
}
void foo(String a) {
foo(a, 0); // here, 0 is a default value for b
}
foo("a", 2);
foo("a");
One of the limitations of this approach is that it doesn't work if you have two optio...
optional local variables in rails partial templates: how do I get out of the (defined? foo) mess?
...ould also use fetch with the optional default_value.
local_assigns.fetch :foo, default_value
This will return default_value if foo wasn't set.
WARNING:
Be careful with local_assigns.fetch :foo, default_value when default_value is a method, as it will be called anyway in order to pass its result...
git mv and only change case of directory
...git stash pop after. Continuing: To get around this, do the following:
mv foo foo2
git add -A
git commit -m "renaming"
mv foo2 FOO
git add -A
git commit --amend -m "renamed foo to FOO"
That's the drawn out way of changing the working directory, committing and then collapsing the 2 commits. You ca...