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What's the meaning of “=>” (an arrow formed from equals & greater than) in JavaScript?
... be used similarly to the way you would use function expressions. In other words, you can often use them in place of expressions like function (foo) {...}. But they have some important differences. For example, they do not bind their own values of this (see below for discussion).
Arrow functions are...
Mongoose's find method with $or condition does not work properly
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can you describe why this solution works with words? thanks
– Alexander Mills
Nov 22 '15 at 23:21
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What is the official “preferred” way to install pip and virtualenv systemwide?
... / or pip at the system level using apt-get seems totally appropriate. One word of caution though is that if you plan on upgrading your distributions Python, that may have a ripple effect through your virtualenvs if you linked back to your system site packages.
I should also mention that none of t...
How do I check if an object has a specific property in JavaScript?
...cal note.
Bear in mind that undefined is (unfortunately) not a reserved word in JavaScript if you’re not using strict mode. Therefore, someone (someone else, obviously) could have the grand idea of redefining it, breaking your code.
A more robust method is therefore the following:
if (typeof(...
What is lexical scope?
... languages..). Take a look. It is important to understand this, as that keyword will lead us to understand lexical scope. howtonode.org/what-is-this
– CppLearner
Aug 8 '11 at 6:13
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TypeScript function overloading
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You word it as if overloading in TypeScript is only possible based on the number of parameters, while overloading based on type is also possible as shown in Steve Fenton's answer.
– Matthijs Wessels
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Why should I declare a virtual destructor for an abstract class in C++?
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i fixed the poor wording of my answer now. it states it explicitly now that it doesn't rely on the clients. actually i thought that's obvious that relying on clients doing something is out the way anyway. thanks :)
– Joh...
More than 10 lines in a node.js stack error?
... And apparently, stack trace doesn't follow async operations. In other words, in a callback of an asynchronous call your stack starts from scratch (it's basically empty).
– x-yuri
Nov 17 '17 at 18:44
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How to debug stream().map(…) with lambda expressions?
...ou're getting confused because map is an intermediate operation - in other words: it is a lazy operation which will be executed only after a terminal operation was executed. So when you call stream.map(n -> n * 2) the lambda body isn't being executed at the moment. You need to set a breakpoint an...
When do items in HTML5 local storage expire?
...however things remain "forever" based on some practical definition of that word.
edit — obviously, your own application can actively remove stuff if it decides it's too old. That is, you can explicitly include some sort of timestamp in what you've got saved, and then use that later to decide whet...