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Ruby: How to turn a hash into HTTP parameters?
...ing Ruby 1.9.2 or later, you can use URI.encode_www_form if you don't need arrays.
E.g. (from the Ruby docs in 1.9.3):
URI.encode_www_form([["q", "ruby"], ["lang", "en"]])
#=> "q=ruby&lang=en"
URI.encode_www_form("q" => "ruby", "lang" => "en")
#=> "q=ruby&lang=en"
URI.encode_ww...
Wait for all promises to resolve
...No mirrors for: ' + img_tags[y].getAttribute('src'));
}
}
var promise_array = [];
for (var y = 0; y < img_tags.length; y++) {
var img_src = img_tags[y].getAttribute('src');
promise_array.push(
checkMirrorAvailability(img_src)
.then(
// a callback functi...
How to initialize HashSet values by construction?
...ent, but fits on a single line:
Set<String> h = new HashSet<>(Arrays.asList("a", "b"));
Again, this is not time efficient since you are constructing an array, converting to a list and using that list to create a set.
When initializing static final sets I usually write it like this:
...
What are the details of “Objective-C Literals” mentioned in the Xcode 4.4 release notes?
...aheads.tumblr.com/post/17757846453/objective-c-literals-for-nsdictionary-nsarray-and:
Objective-C literals: one can now create literals for NSArray, NSDictionary, and NSNumber (just like one can create literals for NSString)
NSArray Literals
Previously:
array = [NSArray arrayWithObjects:a, b, c,...
Plotting a list of (x, y) coordinates in python matplotlib
...
For a 2-column numpy array, plt.scatter( * xy.T ) works: short and obscure for x, y = xy.T; plt.scatter( x, y )
– denis
Jul 14 '16 at 16:43
...
how to replicate pinterest.com's absolute div stacking layout [closed]
...mine column width
Determine margin between columns (the gutter)
Setup an array:
Get the width of the parent container; calculate the # of columns that will fit
Create an empty array, with a length equaling the # of columns. Use this array to store the height of each column as you build the layou...
Pass Variables by Reference in Javascript
...dbye" instead of "hello world"
You can iterate over the properties of an array with a numeric index and modify each cell of the array, if you want.
var arr = [1, 2, 3];
for (var i = 0; i < arr.length; i++) {
arr[i] = arr[i] + 1;
}
It's important to note that "pass-by-reference" is a v...
How to create a drop-down list?
...d.
//There are multiple variations of this, but this is the basic variant.
ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, items);
//set the spinners adapter to the previously created one.
dropdown.setAdapter(adapter);
Notes:
You...
How does one write code that best utilizes the CPU cache to improve performance?
...wers to this. Anyway, one classic example is to iterate a multidimensional array "inside out":
pseudocode
for (i = 0 to size)
for (j = 0 to size)
do something with ary[j][i]
The reason this is cache inefficient is because modern CPUs will load the cache line with "near" memory addresses fro...
互联网造车运动 - 资讯 - 清泛网 - 专注C/C++及内核技术
...其核心技术在于自主设计的底盘和电池控制系统，从最初使用莲花Elise底盘到自主设计，这期间历时长达十年之久，此外，特斯拉还学习了丰田的质量控制和问题追溯体系，还有奔驰的测试流程，传统汽车企业的支持是特斯拉成...