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How can I pass data from Flask to JavaScript in a template?
... sees. If you want your Flask variable to be available in JavaScript as an array, you have to generate an array definition in your output:
<html>
<head>
<script>
var myGeocode = ['{{ geocode[0] }}', '{{ geocode[1] }}'];
</script>
</head>
<body>...
How to get a subset of a javascript object's properties
...everyone else was recommending underscore/lodash for 2 years ago, by using Array.prototype.reduce.
var subset = ['color', 'height'].reduce(function(o, k) { o[k] = elmo[k]; return o; }, {});
This approach solves it from the other side: rather than take an object and pass property names to it to ex...
How to count the number of true elements in a NumPy bool array
I have a NumPy array 'boolarr' of boolean type. I want to count the number of elements whose values are True . Is there a NumPy or Python routine dedicated for this task? Or, do I need to iterate over the elements in my script?
...
Correct way to find max in an Array in Swift
...function (here, it's anonymous) to the accumulator and each element of the array successively, and stores the new value in the accumulator. The last accumulator value is then returned.
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impro...
Size of Matrix OpenCV
...
For 2D matrix:
mat.rows – Number of rows in a 2D array.
mat.cols – Number of columns in a 2D array.
Or:
C++: Size Mat::size() const
The method returns a matrix size: Size(cols, rows) . When the matrix is more than 2-dimensional, the returned size is (-1, -1).
For mult...
What is the equivalent of MATLAB's repmat in NumPy
... dimensions and gives a similar result to matlab. (Numpy gives a 3d output array as you would expect - matlab for some reason gives 2d output - but the content is the same).
Matlab:
>> repmat([1;1],[1,1,1])
ans =
1
1
Python:
In [46]: a = np.array([[1],[1]])
In [47]: np.tile(a, ...
How to convert int[] to Integer[] in Java?
...ed to Integer[] easily:
int[] data = {1,2,3,4,5,6,7,8,9,10};
// To boxed array
Integer[] what = Arrays.stream( data ).boxed().toArray( Integer[]::new );
Integer[] ever = IntStream.of( data ).boxed().toArray( Integer[]::new );
// To boxed list
List<Integer> you = Arrays.stream( data ).boxed...
使用 C++ 处理 JSON 数据交换格式 - C/C++ - 清泛网 - 专注C/C++及内核技术
... Key（名为：key_object），赋予json::Value 对象值。
root["key_array"].append("array_string"); // 新建一个 Key（名为：key_array），类型为数组，对第一个元素赋值为字符串："array_string"。
root["key_array"].append(1234); //...
Get cookie by name
...
One approach, which avoids iterating over an array, would be:
function getCookie(name) {
const value = `; ${document.cookie}`;
const parts = value.split(`; ${name}=`);
if (parts.length === 2) return parts.pop().split(';').shift();
}
Walkthrough
Splitting a st...
PDO MySQL: Use PDO::ATTR_EMULATE_PREPARES or not?
... to do the right thing with different php and mysql versions.
*
* @param array $settings with keys: host, port, unix_socket, dbname, charset, user, pass. Some may be omitted or NULL.
* @return PDO
* @author Francis Avila
*/
function connect_PDO($settings)
{
$emulate_prepares_below_version =...