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When to use RSpec let()?
...ble takes a long time, then you're wasting cycles. For the method defined by let, the initialization code only runs if the example calls it.
You can refactor from a local variable in an example directly into a let without changing the
referencing syntax in the example. If you refactor to an instan...
Namespace + functions versus static methods on a class
...
By default, use namespaced functions.
Classes are to build objects, not to replace namespaces.
In Object Oriented code
Scott Meyers wrote a whole Item for his Effective C++ book on this topic, "Prefer non-member non-friend...
Inserting HTML elements with JavaScript
...
Have a look at insertAdjacentHTML
var element = document.getElementById("one");
var newElement = '<div id="two">two</div>'
element.insertAdjacentHTML( 'afterend', newElement )
// new DOM structure: <div id="one">one</div><div id="two">two</div>
position ...
How to print to the console in Android Studio?
...
Run your application in debug mode by clicking on
in the upper menu of Android Studio.
In the bottom status bar, click 5: Debug button, next to the 4: Run button.
Now you should select the Logcat console.
In search box, you can type the tag of your mes...
What is the difference between Scope_Identity(), Identity(), @@Identity, and Ident_Current()?
... somewhere, the scope_identity() function will return the identity created by the query, while the @@identity function will return the identity created by the trigger.
So, normally you would use the scope_identity() function.
...
Chrome developer tools: View Console and Sources views in separate views/vertically tiled?
...
Vertical split
You can undock the developer tools (by clicking on the icon in the bottom-left corner), which moves it to a new window. Then press Esc to open the console.
Both the window and the "small console" can be resized to meet your needs.
Horizontal split
If you p...
How to access the correct `this` inside a callback?
...function was called, not how/when/where it was defined. It is not affected by lexical scopes like other variables (except for arrow functions, see below). Here are some examples:
function foo() {
console.log(this);
}
// normal function call
foo(); // `this` will refer to `window`
// as object ...
What is path of JDK on Mac ? [duplicate]
...
The location has changed from Java 6 (provided by Apple) to Java 7 and onwards (provided by Oracle). The best generic way to find this out is to run
/usr/libexec/java_home
This is the natively supported way to find out both the path to the default Java installation as ...
How to exclude this / current / dot folder from find “type d”
...lse. This character will also usually need protection from interpretation by the shell.
– Adrian Günter
Oct 28 '15 at 23:55
...
Why is it faster to check if dictionary contains the key, rather than catch the exception in case it
...as to be unwound etc.
On the other hand, accessing a value in a dictionary by its key is cheap, because it's a fast, O(1) operation.
BTW: The correct way to do this is to use TryGetValue
obj item;
if(!dict.TryGetValue(name, out item))
return null;
return item;
This accesses the dictionary on...