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Can someone explain the traverse function in Haskell?
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traverse is the same as fmap, except that it also allows you to run effects while you're rebuilding the data structure.
Take a look at the example from the Data.Traversable documentation.
data Tree a = Empty | Leaf a | Node (Tree a) a (Tree a)
The Functor instance of Tr...
Changing Font Size For UITableView Section Headers
...wForHeaderInSection:(NSInteger)section {
UILabel *myLabel = [[UILabel alloc] init];
myLabel.frame = CGRectMake(20, 8, 320, 20);
myLabel.font = [UIFont boldSystemFontOfSize:18];
myLabel.text = [self tableView:tableView titleForHeaderInSection:section];
UIView *headerView = [[UIV...
How do RVM and rbenv actually work?
I am interested in how RVM and rbenv actually work.
5 Answers
5
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How to create a date and time picker in Android? [closed]
...this response should be updated. The DateSlider library referenced by Rabi all the way below seems to be perfect for this.
– Stephan Branczyk
Aug 7 '11 at 21:09
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Bash: Copy named files recursively, preserving folder structure
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rails 3.1.0 ActionView::Template::Error (application.css isn't precompiled)
...tion.rb
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config.assets.compile = true
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You can use this option to fallback to Sprockets when you are using precompiled assets but there are any missing precompiled files.
If config.assets.compile option is set to false and there are missing precompiled files you will get an "AssetNoPrecompi...
Python Flask, how to set content type
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Try like this:
from flask import Response
@app.route('/ajax_ddl')
def ajax_ddl():
xml = 'foo'
return Response(xml, mimetype='text/xml')
The actual Content-Type is based on the mimetype parameter and the charset (defaults to UTF-8).
Response (and request) objects are docume...
make an html svg object also a clickable link
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The img tag would normally go where the span tag is for this to degrade gracefully.
– Adrian Garner
Oct 8 '12 at 2:26
18
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Given final block not properly padded
...000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 47.7169 7.36433 48.0099 7.26993C48.9099 6.97997 49.672 6.73443 49.672 5.93063C49.672 5.22043 48.9832 4.61182 48.1414 4.61182C47.4335 4.61182 46.7256 4.91628 46.0943 5.50789C45.7307 4.9328 4...
How to validate a url in Python? (Malformed or not)
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Actually, I think this is the best way.
from django.core.validators import URLValidator
from django.core.exceptions import ValidationError
val = URLValidator(verify_exists=False)
try:
val('http://www.google.com')
except Val...