Across the world, most of the businesses are turning their physical stores into online store because of its constant growing popularity. In this post, you can find huge information on online retail sales in Europe that is expected to double to EUR323 billion by 2018
Expect is an extension to the Tcl scripting language to create an automation and testing tool for CLI applications such as telnet, ftp, passwd, fsck, rlogin, tip, ssh, et., and because it wraps the standard command-line interface, it can be used to automate any arbitrary applications that are accessed over a terminal.
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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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Google is predicted to reveal its next mobile and tablet os version, currently stated to be known as it when released in a designer review (like Android os L for Lollipop)
The next release of Weave (any day now) is expected to include P2P sharing of bookmark folders via XMPP, on top of the ability to synchronize your bookmarks, browsing history, and even your cookies, passwords, and form data...
Google does R&D but has no dedicated researchers or formal lab organization. Every engineer is considered part of the virtual R&D team and is expected to donate 20% of his time - about one day a week - to research.
Xerox takes the traditional approach, investing in a separate R&D function that includes basic research ... what makes each approach successful?
"Nietzsche would have been right at home on an ugly team: what does not kill the ugly team makes the ugly team stronger."
"Real heroes are ugly. [...] In spite of their failings, they find ways to achieve, betting everything on passion, persistence, and imagination. [...] For these reasons, when things get tough, it's the ugly teams that win. People from ugly teams expect things to go wrong and show up anyway. They conquer self-doubt, make friendships under fire, and find magic in ideas that others abandon."
Some quotable quotes here: "while we laugh at the guy who expected that his computer could be hooked up to his boom box to use the cd, he's actually just a bit ahead of us. Yes, ahead, not behind. In the future, he probably could get his computer to talk the boom box into transferring data from its cd."
"When I was a teenager, I had a friend who made extra money testing and changing vacuum tubes in TV's and radios. Try earning money that way today- there is actually a very small market for that kind of thing, and there are still people who sell tubes and the like, but that market is pretty small. In the dumbed down computers of the future, there may still be a few antique machines kicking around here and there, but that isn't going to support very many of us."
This is largely true and happening all the time. A programmer can use Python or Smalltalk without needing to know C (or Fortran or assembler.) A child can program in Morphic tiles (Etoys and Scratch)! We don't need to know the difference between a serial cable and a printer cable, or how to install a driver' it is all USB (or Bluetooth!) There are some gurus that program USB, but perhaps only a few hundred of them, and the rest of us just use it.
It is always important to know how to submit a bug report. It doesn't help that every community has different expectations, and every bug tracking system has a different layout. In Squeak, the learning curve is long but shallow.
In this 23 minute screencast, Ken Causey starts with some bug hunting tips, and explains how to make a Smalltalk changeset file that is numbered, documented and compressed. He then shows how to submit this to the Mantis server on bugs.squeak.org.
Along the road in the town of Tachilek in Myanmar's northeastern region, yesterday, visible cracks after the previous night rocked by an earthquake measuring 6.8 on the Richter Scale. The quake has killed at least 75 people in Myanmar and Thailand. The victim is expected to continue to grow.
The death toll from the earthquake in Japan continue to grow to 50 people. The number of casualties was expected to continue to grow because the police still record in a number of areas affected.
Underscore is a utility-belt library for JavaScript that provides a lot of the functional programming support that you would expect in Prototype.js (or Ruby), but without extending any of the built-in JavaScript objects. It's the tie to go along with jQuery's tux.
Mobile App Testing is a process to find out the errors which occurred during app development. Testing also ensures that user expectation met and application execute properly. It is equally important to conduct device testing to make sure that mobile application performs well across several platform and devices. Here we are presenting testing at a glance; our goal is to provide optimistic and useful process for user to test apps effectively.
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