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How do I loop through or enumerate a JavaScript object?
...
Under ECMAScript 5, you can combine Object.keys() and Array.prototype.forEach():
var obj = { first: "John", last: "Doe" };
Object.keys(obj).forEach(function(key) {
console.log(key, obj[key]);
});
ECMAScript 6 adds for...of:
for (const key of Object.keys(obj)) {
cons...
Simple way to create matrix of random numbers
... rand(d0, d1, ..., dn)
Random values in a given shape.
Create an array of the given shape and propagate it with random
samples from a uniform distribution over [0, 1).
>>> import numpy as np
>>> np.random.rand(2,3)
array([[ 0.22568268, 0.0053246 , 0.41282024],
...
Ruby on Rails: Where to define global constants?
...the same as above
The two options above allow you to change the returned array on each invocation of the accessor method if required. If you have true a truly unchangeable constant, you can also define it on the model class:
class Card < ActiveRecord::Base
COLOURS = ['white', 'blue'].freeze
...
Cast Int to enum in Java
...
@Tarrasch as arrays are mutable, values() must return a copy of the array of elements just in case you happen to change it. Creating this copy each time is relatively expensive.
– Peter Lawrey
Dec 4 ...
How can I convert JSON to CSV?
...ontent_type": 8
}
After applying this function to each dict in the input array of JSON objects:
input = map( lambda x: flattenjson( x, "__" ), input )
and finding the relevant column names:
columns = [ x for row in input for x in row.keys() ]
columns = list( set( columns ) )
it's not hard to...
Assert equals between 2 Lists in Junit
...'t around then. But now, it's easy to just do this:
@Test
public void test_array_pass()
{
List<String> actual = Arrays.asList("fee", "fi", "foe");
List<String> expected = Arrays.asList("fee", "fi", "foe");
assertThat(actual, is(expected));
assertThat(actual, is(not(expected)));
...
Looping through a hash, or using an array in PowerShell
...ion
Be careful sorting your hashtable...
Sort-Object may change it to an array:
PS> $hash.GetType()
IsPublic IsSerial Name BaseType
-------- -------- ---- --------
True True Hashtable ...
CodeIgniter: Create new helper?
I need to loop lot of arrays in different ways and display it in a page. The arrays are generated by a module class. I know that its better not to include functions on 'views' and I want to know where to insert the functions file.
...
What is the use of Enumerable.Zip extension method in Linq?
... );
This is useful when you have data spread into simple, array-like lists, each with the same length and order, and each describing a different property of the same set of objects. Zip helps you knit those pieces of data together into a more coherent structure.
So if you have an ...
How can I parse a CSV string with JavaScript, which contains comma in data?
...ript function which converts a valid CSV string (as defined above) into an array of string values.
Solution:
The regular expressions used by this solution are complex. And (IMHO) all non-trivial regular expressions should be presented in free-spacing mode with lots of comments and indentation. Unfor...