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Join strings with a delimiter only if strings are not null or empty
...er
var address = "foo";
var city;
var state = "bar";
var zip;
text = [address, city, state, zip].filter(Boolean).join(", ");
console.log(text)
.filter(Boolean) (which is the same as .filter(x => x)) removes all "falsy" values (nulls, undefineds, empty strings etc). If your defi...
How do you reverse a string in place in C or C++?
...tead of the end-finding loop.
(Editor's note: this answer originally used XOR-swap for this simple version, too. Fixed for the benefit of future readers of this popular question. XOR-swap is highly not recommended; hard to read and making your code compile less efficiently. You can see on the Go...
Show data on mouseover of circle
...en I mouseover one of the circles I would like it to popup with data (like x, y values, maybe more). Here is what I tried using:
...
How to permanently set $PATH on Linux/Unix? [closed]
I'm trying to add a directory to my path so it will always be in my Linux path. I've tried:
24 Answers
...
Setting individual axis limits with facet_wrap and scales = “free” in ggplot2
...h a plot of predicted value vs. residuals. I'll be using shiny to help explore the results of modeling efforts using different training parameters. I train the model with 85% of the data, test on the remaining 15%, and repeat this 5 times, collecting actual/predicted values each time. After calcu...
苹果全球开发者大会：无硬件 iOS 9等三大系统更新 - 资讯 - 清泛网 - 专注C...
...台做了简短开场介绍，并透露本次大会上讲公布iOS 9、OS X、watchOS三款重要系统更新以及其他服务。随着发布会的结束，更多细节也已公布，接下来我们就一起来回顾一下本次大会的重点内容。
iOS 9 重新设计更懂你
被重新设...
Compile time string hashing
...ceeded in implementing a compile-time CRC32 function with the use of constexpr. The problem with it is that at the time of writing, it only works with GCC and not MSVC nor Intel compiler.
Here is the code snippet:
// CRC32 Table (zlib polynomial)
static constexpr uint32_t crc_table[256] = {
0x...
removeEventListener on anonymous functions in JavaScript
...ce to it.
var t = {};
var handler = function(e) {
t.scroll = function(x, y) {
window.scrollBy(x, y);
};
t.scrollTo = function(x, y) {
window.scrollTo(x, y);
};
};
window.document.addEventListener("keydown", handler);
You can then remove it by
window.document.remov...
What is the difference between Polymer elements and AngularJS directives?
On the Polymer Getting Started page, we see an example of Polymer in action:
10 Answers
...
How to switch position of two items in a Python list?
...e', 'email', 'password2', 'password1', 'first_name',
'last_name', 'next', 'newsletter']
a, b = i.index('password2'), i.index('password1')
i[b], i[a] = i[a], i[b]
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