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How do I clear only a few specific objects from the workspace?
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A useful way to remove a whole set of named-alike objects:
rm(list = ls()[grep("^tmp", ls())])
thereby removing all objects whose name begins with the string "tmp".
Edit: Following Gsee's comment, making use of the pattern argument:
rm(list = ls(patte...
How to break a line of chained methods in Python?
...th assignment operator. Imagine you want to break lines in this chain: foo.set_default('bar', {}).set_default('spam', {}).set_default('eggs', {})['lol'] = 'yeah'
– loutre
Jul 9 '18 at 14:20
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Detect when browser receives file download
...If it has a non-empty value, drop a cookie (e.g. "fileDownloadToken"), and set its value to the token's value.
Client source code (JavaScript):
function getCookie( name ) {
var parts = document.cookie.split(name + "=");
if (parts.length == 2) return parts.pop().split(";").shift();
}
functi...
Why are Oracle table/column/index names limited to 30 characters?
... VARCHAR2(2) doesn't mean 2 characters but 2 byte.
– Seth
Jan 26 '17 at 8:52
1
I see your point, ...
Is there a way to use SVG as content in a pseudo element :before or :after
...deathlock Of course it scales, though not my sample as it has a fixed size set, 80px wide/high.
– Ason
Oct 3 '16 at 15:00
1
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Is it faster to count down than it is to count up?
...uction with a smaller binary encoding
If a previous instruction happens to set a flag (likely only on x86 family machines), you might not even need an explicit compare instruction
Are these differences likely to result in any measurable improvement on real programs on a modern out-of-order process...
jQuery how to find an element based on a data-attribute value?
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Notice that it doesn't work for elements where you set data with $('#element').data('some-att-name', value); but only for those with hardcoded attribute. I've got this problem and to make it work set data by writing the attribute directly $('#element').attr('data-some-att-nam...
构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...中维护用户id和shard的关系，为了保证可用性，搭建replicatset集群。
biz的sharding和数据库的sharding是一一对应的，只访问一个数据库sharding.
biz业务注册节点到zookeeper上/bizs/shard/下。
router监听zookeeper上/bizs/下节点状态，缓存在线bi...
How can I specify a local gem in my Gemfile?
...to use a different branch in development from production, you also have to set bundle config disable_local_branch_check true or Bundler will complain about the branch. Be careful with this though, as the checks are supposed to stop incorrect commits getting into Gemfile.lock. Docs here: bundler.io/v...