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Big O, how do you calculate/approximate it?
...oop, as function calls can do > O(1) work themselves. In the C standard APIs for instance, bsearch is inherently O(log n), strlen is O(n), and qsort is O(n log n) (technically it has no guarantees, and quicksort itself has a worst case complexity of O(n²), but assuming your libc author isn't a m...
What are the effects of exceptions on performance in Java?
...ating that a method might fail. There's no other way to tell from just the API which methods are expected to always (mostly) work and which are expected to report failure.
Exceptions are safer than sentinels, faster than result objects, and less surprising than either. I'm not suggesting that try/c...
How do I uniquely identify computers visiting my web site?
...ique in our sample.
By observing returning visitors, we estimate how rapidly browser fingerprints might change over time. In our sample, fingerprints changed quite
rapidly, but even a simple heuristic was usually able to guess when a fingerprint was an “upgraded” version of a previously o...
What does the Java assert keyword do, and when should it be used?
... I don't agree. Many of my assertions are used to make sure my API is getting called correctly. For example, I might write a private method that should only be called when an object holds a lock. If another developer calls that method from part of the code that doesn't lock the object, t...
从Sloodle看三维虚拟学习环境的发展趋势 - 资讯 - 清泛网 - 专注C/C++及内核技术
...11所示。这个工具实际上调用了 Google免费提供的 Translator API,目前支持 51种语言。
图11 Translator
(三) Sloodle中的教学活动
Sloodle中的教学活动大致分为四类 :角色扮演和模拟、团队合作、事件展示、构建性活动 (如创造...
Pass props to parent component in React.js
...u can avoid any hookup with Child altogether.
JSX has a spread attributes API I often use on components like Child. It takes all the props and applies them to a component. Child would look like this:
var Child = React.createClass({
render: function () {
return <a {...this.props}> {this...
How to use glOrtho() in OpenGL?
... popular choice for calculating such matrices. http://glm.g-truc.net/0.9.2/api/a00245.html documents both an ortho and frustum operations.
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How to detect if multiple keys are pressed at once using JavaScript?
...ener left over.
For thoroughness, here is a quick reference to the class's API, presented in C/Java style so you know what they return and what arguments they expect.
Boolean key_down (String key);
Returns true if key is down, false otherwise.
Boolean keys_down (String key1, String key2, ...);
...
How can I reliably determine the type of a variable that is declared using var at design time?
... of a possible 'interface' if you already had the compiler available as an API to call into.
The other route
What does the Reflect object do in JavaScript?
...et, name);
// now do the default thing
}
});
The Reflect and Proxy APIs were designed in tandem, such that for each Proxy trap, there exists a corresponding method on Reflect that "does the default thing". Hence, whenever you find yourself wanting to "do the default" thing inside a Proxy han...