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How to elegantly rename all keys in a hash in Ruby? [duplicate]
... = { 'Bruce' => 'Bruce Wayne', 'Clark' => 'Clark Kent' }
ages.transform_keys(&mappings.method(:[]))
#=> { 'Bruce Wayne' => 32, 'Clark Kent' => 28 }
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How to set breakpoints in inline Javascript in Google Chrome?
...s missing! I tried to use the javascript console, which itself is buggy - for example, once it encounters a JS error, I cannot get out of it unless I refresh the whole page. Can someone help?
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How can I convert an RGB image into grayscale in Python?
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How about doing it with Pillow:
from PIL import Image
img = Image.open('image.png').convert('LA')
img.save('greyscale.png')
Using matplotlib and the formula
Y' = 0.2989 R + 0.5870 G + 0.1140 B
you could do:
import numpy as np
import matplotlib.pyplot as plt
im...
How to correctly use the extern keyword in C
...estion is about when a function should be referenced with the extern keyword in C.
10 Answers
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How to hide action bar before activity is created, and then show it again?
...ER requestFeature
This creates the ActionBar and immediately hides it before it had the chance to be displayed.
But now there is another problem. After putting windowActionBar="false" in the theme, the Activity draws its normal Window Title instead of an ActionBar.
If we try to avoid this by usin...
Java and SQLite [closed]
...d to the neatness that a single file database provides. What driver/connector library is out there to connect and use SQLite with Java.
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How many characters can UTF-8 encode?
...bets, as well as Combining Diacritical Marks.
Three bytes are needed for characters in the rest of the Basic Multilingual Plane, which contains virtually all characters in common use[12] including most Chinese, Japanese and Korean [CJK] characters.
Four bytes are needed for characters in t...
Default behavior of “git push” without a branch specified
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You can control the default behavior by setting push.default in your git config. From the git-config(1) documentation:
push.default
Defines the action git push should take if no refspec is given on the command line, no refspec is configured in the remote, ...
Matplotlib 2 Subplots, 1 Colorbar
...earching how to get two subplots to share the same y-axis with a single colorbar shared between the two in Matplotlib.
10 ...
How do I base64 encode (decode) in C?
...= malloc(*output_length);
if (encoded_data == NULL) return NULL;
for (int i = 0, j = 0; i < input_length;) {
uint32_t octet_a = i < input_length ? (unsigned char)data[i++] : 0;
uint32_t octet_b = i < input_length ? (unsigned char)data[i++] : 0;
uint32_t oct...