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How can I add a key/value pair to a JavaScript object?
...cket notation:
obj["key3"] = "value3";
The first form is used when you know the name of the property. The second form is used when the name of the property is dynamically determined. Like in this example:
var getProperty = function (propertyName) {
return obj[propertyName];
};
getProperty("...
How to remove old Docker containers
...
Updated Answer
Use docker system prune or docker container prune now. See VonC's updated answer.
Previous Answer
Composing several different hints above, the most elegant way to remove all non-running containers seems to be:
docker rm $(docker ps -q -f status=exited)
-q prints just the...
Rename master branch for both local and remote Git repositories
...te
However this has a lot of caveats. First, no existing checkouts will know about the rename - git does not attempt to track branch renames. If the new master doesn't exist yet, git pull will error out. If the new master has been created. the pull will attempt to merge master and master-old. So i...
Why is #!/usr/bin/env bash superior to #!/bin/bash?
...bash 4) than it is for there to multiple env programs. ...Still true that knowing these differences does not lend well to beginners being able to delve in.
– Kevin
Jul 23 '19 at 15:10
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What is the difference between an Azure Web Site and an Azure Web Role
...eaming, etc.)
With the April 2014 and September 2014 rollouts, there are now some features common to both Web Apps and Web Roles (and Worker Roles), including:
Staging+production slots
Wildcard DNS, SSL certificates
Visual Studio integration
Traffic Manager support
Virtual Network support
Here...
What's the best way to trim std::string?
...pp>
std::string str("hello world! ");
boost::trim_right(str);
str is now "hello world!". There's also trim_left and trim, which trims both sides.
If you add _copy suffix to any of above function names e.g. trim_copy, the function will return a trimmed copy of the string instead of modifying...
How to delete an item in a list if it exists?
... in iterable if item] if the first argument is None); in Python 3.x, it is now equivalent to (item for item in iterable if function(item)). The subtle difference is that filter used to return a list, now it works like a generator expression - this is OK if you are only iterating over the cleaned lis...
Get integer value of the current year in Java
... get the year in your system's default time zone), you could use the Year::now method:
int year = Year.now().getValue();
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Modifying location.hash without page scrolling
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It would be useful to know which browsers need step 2 here.
– djc
Nov 5 '10 at 9:51
1
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How can I replace a newline (\n) using sed?
...need the \n to find what you're looking for. Since GNU sed
version 3.02.80 now supports this syntax:
sed '/start/,+4d' # to delete "start" plus the next 4 lines,
in addition to the traditional '/from here/,/to there/{...}' range
addresses, it may be possible to avoid the use of \n ent...