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Not all operators are
symbols. Some are written as words. One example is the typeof
operator, which produces a string value naming the type of the value
you give it.
Having such numbers is
useful for storing strings inside a computer because it makes it
possible to represent them as a sequence of numbers. When comparing
strings, JavaScript goes over them from left to right, comparing the
numeric codes of the characters one by one.
There is only one value in JavaScript
that is not equal to itself, and that is NaN, which stands for “not
a number”.
In practice, you can usually get by with knowing that of the
operators we have seen so far, || has the lowest precedence, then
comes &&, then the comparison operators (>, ==, and so on), and
then the rest. This order has been chosen such that, in typical
expressions like the following one, as few parentheses as possible are
necessary:
The difference in meaning between undefined and null is an accident
of JavaScript’s design, and it doesn’t matter most of the time. In the cases
where you actually have to concern yourself with these values, I
recommend treating them as interchangeable (more on that in a moment).
. Yet in the third expression, + tries string
concatenation before numeric addition
When something that
doesn’t map to a number in an obvious way (such as "five" or
undefined) is converted to a number, the value NaN is produced.
Further arithmetic operations on NaN keep producing NaN, so if you
find yourself getting one of those in an unexpected place, look for
accidental type conversions.
g ==, the
outcome is easy to predict: you should get true when both values are
the same, except in the case of NaN.
But when the types differ,
JavaScript uses a complicated and confusing set of rules to determine
what to do. In most cases, it just tries to convert one of the values
to the other value’s type. However, when null or undefined occurs
on either side of the operator, it produces true only if both sides
are one of null or undefined.
That last piece of behavior is often useful. When you want to test
whether a value has a real value instead of null or undefined, you
can simply compare it to null with the == (or !=) operator.
The rules for
converting strings and numbers to Boolean values state that 0,
NaN, and the empty string ("") count as false, while all the
other values count as true.
where you
do not want any automatic type conversions to happen, there are two
extra operators: === and !==. The first tests whether a value is
precisely equal to the other, and the second tests whether it is not
precisely equal. So "" === false is false as expected.
The
logical operators && and || handle values of different types in a
peculiar way. They will convert the value on their left side to
Boolean type in order to decide what to do, but depending on the
operator and the result of that conversion, they return either the
original left-hand value or the right-hand value.
The || operator, for example, will return the value
to its left when that can be converted to true and will return the
value on its right otherwise. This conversion works as you’d expect
for Boolean values and should do something analogous for values of
other types.
This functionality allows the || operator to be
used as a way to fall back on a default value. If you give it an
expression that might produce an empty value on the left, the value on
the right will be used as a replacement in that case.
The && operator works similarly, but the other way
around. When the value to its left is something that converts to
false, it returns that value, and otherwise it returns the value on
its right.
Another important property of these two
operators is that the expression to their right is evaluated only when
necessary. In the case of true || X, no matter what X is—even if
it’s an expression that does something terrible—the result will be
true, and X is never evaluated. The same goes for false && X,
which is false and will ignore X. This is called short-circuit
evaluation.
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arrays of reference types are covariant in their element type, but not safely
where did that exception come from? It came from the runtime, which was in a unique position to know what the real type of the array object was, and the real type of the element. It needed to determine if the assignment was allowable and throw if not. Now if you think about this for a minute, you can see that it’s going to have to perform that check for every assignment to an array element
So if I want to have an array of reference types, but get the runtime to treat it like an array of value types, what have I got to do? Just wrap the reference type in a value type
So I got rid of that check, right? But I added the initialization of a value type. Did I win or lose? Let’s do some timing to figure it out.
when I build Debug binaries, the Reference<T> trick makes my example about three times SLOWER.
Arrays are covariant only for reference types. If you use a struct wrapper to turn a reference type into a value type, the initialization of the value type takes less time than array assignment.
The goal of mindtouch.doc was to generate hierarchical reference documentation that could easily be imported into an MindTouch install.
The generated documentation has an external dependency on a template called DocToc. The purpose of this template is to allow simple Table of content customization using DekiScript and to make it easy to include custom css for documentation pages.
Phalanger is a new PHP implementation introducing the PHP language into the family of compiled .NET languages
Makes PHP first-class citizen in the .NET languages family
Compiles PHP language to the MSIL (Microsoft Intermediate Language), which is a byte-code assembly used by the .NET CLR
Allows using .NET objects from the PHP language thanks to the PHP/CLR Language Extensions
Enables using libraries written in PHP from other .NET languages
Being an effective unlearner enables you to take an unbiased look at a new way of approaching a situation/problem/challenge without the weight of being dragged down by your old baggage(ideas
Being an effective unlearner enables you to take an unbiased look at a new way of approaching a situation/problem/challenge without the weight of being dragged down by your old baggage(ideas)
One strategy to minimize this is to seek out and collaborate with people who make you feel a little out of your element
Unfortunately, with the large number of these
blogs, many people have fallen into the trap of subscribing to too many
he started to get frustrated by the abscensce of any new insights/techniques he
was sure would magically manifest when working through coding sessions.
Any man who reads too much and uses his own brain too little falls into lazy habits of thinking
Don't think about what you have accomplished. Rather, what you should have accomplished with your abilities.
People who allow themselves to get into this mode more often can find that the spikes in creativity that result, can carry forward with them into the stuff that they have to tackle on a day to day basic
Gifts, however , have to be opened, and then further used, if they are going to be of any value
When you think you have caught up with the skill of [developer x], either their skill level has increased or you have found another developer whose skill you covet
It's not about being the best. It's about being your best.
It can give them an change to explore and think about problemsthat they may not feel comfortable with
There will always be someone who is better than you, there will always be someone who is not.
If you end your days with the persitent feeling of "I do not feel like I got enough done", it could be an indicator that some significant diagnostics need to be performed
can create an environment where synergy, collaboration, and friendly competitiveness raise the level of all of the people on the team
The Sample Code Generator (XSDObjectGen) tool takes an XSD schema as input and generates sample code showing how to mark up C# and VB.Net classes so that when serialized with the XML serializer, the resulting XML will be valid according to the original schema.