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Ruby on Rails: How can I revert a migration with rake db:migrate?
...nt to revert.
eg. if you want to revert a migration with file name 3846656238_create_users.rb
rake db:migrate:down VERSION=3846656238
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What blocks Ruby, Python to get Javascript V8 speed? [closed]
...ers).
Lars Bak, the lead developer, has been literally working on VMs for 25 years (and all of those VMs have lead up to V8), which is basically his entire (professional) life. Some of the people writing Ruby VMs aren't even 25 years old.
Are there any Ruby / Python features that are blocking i...
How to dismiss a Twitter Bootstrap popover by clicking outside?
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How can I use getSystemService in a non-activity class (LocationManager)?
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286
You need to pass your context to your fyl class..
One solution is make a constructor like this...
Remove element by id
...o about extending the DOM read this article.
EDIT: Reviewing my answer in 2019, node.remove() has come to the rescue and can be used as follows (without the polyfill above):
document.getElementById("my-element").remove();
or
[...document.getElementsByClassName("my-elements")].map(n => n &...
Status bar won't disappear
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Try adding the following method to your app's root view controller:
- (BOOL)prefersStatusBarH...
fatal error: Python.h: No such file or directory
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28 Answers
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Is it safe to delete a NULL pointer?
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delete performs the check anyway, so checking it on your side adds overhead and looks uglier. ...
How do I do a multi-line string in node.js?
...${num} is ${num + num}.`);
which will print "the result of 10 plus 10 is 20." to the console.
Older versions of node
Older version of node can use a "line continuation" character allowing you to write multi-line strings such as:
'this is a \
single string'
which evaluates to: 'this is a singl...
Cast Double to Integer in Java
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edited Sep 29 '18 at 21:38
Jack Giffin
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