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handlerbars.js check if list is empty
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If you have something that you want to display once and only if the array has data, use
{{#if items.length}}
//Render
{{/if}}
.length will return 0 for empty arrays so we have achieved a real falsey value.
shar...
Dynamically access object property using variable
... Some more info on why this is possible: JS objects are associative arrays, that's why. Further Reading: quirksmode.org/js/associative.html stackoverflow.com/questions/14031368/…
– Sudhanshu Mishra
Jun 3 '14 at 9:00
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How fast is D compared to C++?
...ually got D going faster for LDC/clang++, operating on the assumption that arrays must be allocated dynamically (xs and associated scalars). See below for some numbers.
Questions for the OP
Is it intentional that the same seed be used for each iteration of C++, while not so for D?
Setup
I have t...
Pick a random value from an enum?
...ould suggest is caching the result of values() because each call copies an array. Also, don't create a Random every time. Keep one. Other than that what you're doing is fine. So:
public enum Letter {
A,
B,
C,
//...
private static final List<Letter> VALUES =
Collections.unmodifi...
Python: Select subset from list based on index set
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I see 2 options.
Using numpy:
property_a = numpy.array([545., 656., 5.4, 33.])
property_b = numpy.array([ 1.2, 1.3, 2.3, 0.3])
good_objects = [True, False, False, True]
good_indices = [0, 3]
property_asel = property_a[good_objects]
property_bsel = property_b[good_indices]
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Only get hash value using md5sum (without filename)
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A simple array assignment works... Note that the first element of a bash array can be addressed by just the name without the [0] index, ie, $md5 contains only the 32 chars of the md5sum.
md5=($(md5sum file))
echo $md5
# 53c8fdfcbb...
How to use cURL to get jSON data and decode the data?
... dump a beauty json :3
var_dump(json_decode($result, true));
Accessing
$array["threads"][13/* thread id */]["title"/* thread key */]
And
$array["threads"][13/* thread id */]["content"/* thread key */]["content"][23/* post id */]["message" /* content key */];
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ASP.Net MVC: How to display a byte array image from model
I've a model with a byte array image file that I want to show on the page.
10 Answers
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How can I quantify difference between two images?
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General idea
Option 1: Load both images as arrays (scipy.misc.imread) and calculate an element-wise (pixel-by-pixel) difference. Calculate the norm of the difference.
Option 2: Load both images. Calculate some feature vector for each of them (like a histogram). Calcu...
Convert bytes to a string
... Maybe this will help somebody further: Sometimes you use byte array for e.x. TCP communication. If you want to convert byte array to string cutting off trailing '\x00' characters the following answer is not enough. Use b'example\x00\x00'.decode('utf-8').strip('\x00') then.
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