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Save modifications in place with awk
...the GNU "sed -i" feature. [...]
Example usage:
$ gawk -i inplace '{ gsub(/foo/, "bar") }; { print }' file1 file2 file3
To keep the backup:
$ gawk -i inplace -v INPLACE_SUFFIX=.bak '{ gsub(/foo/, "bar") }
> { print }' file1 file2 file3
...
How do browser cookie domains work?
...ple.com) will only be accessible for other domains below that domain (e.g. foo.www.example.com or bar.www.example.com) where .example.com can also be accessed by any other domain below example.com (e.g. foo.example.com or bar.example.com).
...
finding and replacing elements in a list
...a dictionary:
a = [1, 2, 3, 4, 1, 5, 3, 2, 6, 1, 1]
dic = {1:10, 2:20, 3:'foo'}
print([dic.get(n, n) for n in a])
> [10, 20, 'foo', 4, 10, 5, 'foo', 20, 6, 10, 10]
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What it the significance of the Javascript constructor property?
...reate your object. If you typed new Bar() it will be Bar and you typed new Fooit will be Foo.
The prototype
The prototype property is used for lookup in case the object in question does not have the property asked for. If you write x.attr, JavaScript will try to find attr among x's attributes. If ...
Is there a way to instantiate a class by name in Java?
...stance() method on this object:
Class<?> clazz = Class.forName("com.foo.MyClass");
Constructor<?> constructor = clazz.getConstructor(String.class, Integer.class);
Object instance = constructor.newInstance("stringparam", 42);
Both methods are known as reflection. You will typically hav...
bodyParser is deprecated express 4
...nded true is that not using extended means that curl --data "user[email]=foo&user[password]=bar" localhost:3000/login would be received by the server in req.body as { user[email]: "foo", ...} whereas req.body would be {user: {email: "foo", ... }} with extended: true.
– ...
setState vs replaceState in React.js
...
Definition by example:
// let's say that this.state is {foo: 42}
this.setState({bar: 117})
// this.state is now {foo: 42, bar: 117}
this.setState({foo: 43})
// this.state is now {foo: 43, bar: 117}
this.replaceState({baz: "hello"})
// this.state. is now {baz: "hello"}
Take...
How does the “this” keyword work?
...is
Simple function invocation
Consider the following function:
function foo() {
console.log("bar");
console.log(this);
}
foo(); // calling the function
Note that we are running this in the normal mode, i.e. strict mode is not used.
When running in a browser, the value of this would be ...
Double Negation in C++
...ompiler warning. Try this:
int _tmain(int argc, _TCHAR* argv[])
{
int foo = 5;
bool bar = foo;
bool baz = !!foo;
return 0;
}
The 'bar' line generates a "forcing value to bool 'true' or 'false' (performance warning)" on MSVC++, but the 'baz' line sneaks through fine.
...
How to add/update an attribute to an HTML element using JavaScript?
...nnerHTML slop, I would treat it like one and stick with the e.className = 'fooClass' and e.id = 'fooID'. This is a design preference, but in this instance trying to treat is as anything other than an object works against you.
It will never backfire on you like the other methods might, just be awar...