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In Firebase, is there a way to get the number of children of a node without loading all the node dat
...o count children without loading data, but we do plan to add it.
For now, one solution would be to maintain a counter of the number of children and update it every time you add a new child. You could use a transaction to count items, like in this code tracking upvodes:
var upvotesRef = new Firebas...
Switch Git branch without files checkout
... strategy of avoiding the git plumbing commands and favoring the porcelain ones.
– user64141
Oct 14 '16 at 17:13
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Determine installed PowerShell version
.... While $PSVersionTable will show the true version. Hope it would help someone..
– vulcan raven
Oct 23 '12 at 4:27
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Git is ignoring files that aren't in gitignore
... This is much better than the accepted answer. No offense to that one, but this saved my day. Thank you kenorb.
– luanjunyi
Aug 4 '15 at 21:46
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How to unstash only certain files?
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As mentioned below, and detailed in "How would I extract a single file (or changes to a file) from a git stash?", you can apply use git checkout or git show to restore a specific file.
git checkout stash@{0} -- <filename>
With...
What does “abstract over” mean?
...onsider a program that takes the sum of the numbers 1, 2, and 3:
val sumOfOneTwoThree = 1 + 2 + 3
This program is not very interesting, since it's not very abstract. We can abstract over the numbers we're summing, by integrating all lists of numbers under a single symbol ns:
def sumOf(ns: List[I...
Get the IP address of the machine
...ly, it works fine for me on os x 10.5 and should be the same below.
I've done a quick example below which will print all of the machine's IPv4 address, (you should also check the getifaddrs was successful ie returns 0).
I've updated it show IPv6 addresses too.
#include <stdio.h>
#incl...
What is a lambda (function)?
...fields and functions, whereas a lambda function generally only consists of one line of instructions. This can vary depending on the language of course.
– zdimension
Apr 20 '18 at 13:05
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Download single files from GitHub
...r each repository that you can use to upload files. If you need more than one binary, you can use a .zip file.
The URL to download an uploaded file is:
https://github.com/downloads/user/repository/filename
Note that the URLs given above, from the links on github.com, will redirect to raw.githubu...
What is the difference between attribute and property? [closed]
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@Alnitak Clear cut answer. I made a one of the century for you.
– mkHun
Apr 14 '17 at 11:56
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