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When to use ' (or quote) in Lisp?
... 2. The value of the symbol a is looked up in the current variable binding set, and then replaced. Say a is currently bound to the value 3:
(let ((a 3))
(* (+ a 2)
3))
We'd get (+ 3 2), + is then invoked on 3 and 2 yielding 5. Our original form is now (* 5 3) yielding 15.
Explain quote ...
How can one close HTML tags in Vim quickly?
...
Check this out..
closetag.vim
Functions and mappings to close open HTML/XML tags
https://www.vim.org/scripts/script.php?script_id=13
I use something similar.
share
...
How do I use itertools.groupby()?
...owing example, items in xx are grouped by values in yy. In this case, one set of zeros is output first, followed by a set of ones, followed again by a set of zeros.
xx = range(10)
yy = [0, 0, 0, 1, 1, 1, 0, 0, 0, 0]
for group in itertools.groupby(iter(xx), lambda x: yy[x]):
print group[0], lis...
How to redirect to a 404 in Rails?
...ender :text => 'Not Found', :status => '404'
Here's a typical test set of mine for something I expect to return 404, using RSpec and Shoulda matchers:
describe "user view" do
before do
get :show, :id => 'nonsense'
end
it { should_not assign_to :user }
it { should respond_wi...
How to set HTTP headers (for cache-control)?
...
You can set the headers in PHP by using:
<?php
//set headers to NOT cache a page
header("Cache-Control: no-cache, must-revalidate"); //HTTP 1.1
header("Pragma: no-cache"); //HTTP 1.0
header("Expires: Sat, 26 Jul 1997 05:0...
How do I use .toLocaleTimeString() without displaying seconds?
...
You can always set the options, based on this page you can set, to get rid of the seconds, something like this
var dateWithouthSecond = new Date();
dateWithouthSecond.toLocaleTimeString([], {hour: '2-digit', minute:'2-digit'});
Supported...
Is there a range class in C++11 for use with range based for loops?
I found myself writing this just a bit ago:
8 Answers
8
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Print an integer in binary format in Java
I have a number and I want to print it in binary. I don't want to do it by writing an algorithm, Is there any built-in function for that in Java?
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How to randomly select an item from a list?
...o randomly select more than one item from a list, or select an item from a set, I'd recommend using random.sample instead.
import random
group_of_items = {1, 2, 3, 4} # a sequence or set will work here.
num_to_select = 2 # set the number to select here.
list_...
How to make my custom type to work with “range-based for loops”?
Like many people these days I have been trying the different features that C++11 brings. One of my favorites is the "range-based for loops".
...