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What is the purpose of the var keyword and when should I use it (or omit it)?
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1370
If you're in the global scope then there's not much difference. Read Kangax's answer for explana...
When and why I should use session_regenerate_id()?
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edited Jun 20 at 9:12
Community♦
111 silver badge
answered Apr 9 '14 at 14:24
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What database does Google use?
...ts of the table as split along a row chosen such that the tablet will be ~200 megabytes in size.
Architecture
BigTable is not a relational database. It does not support joins nor does it support rich SQL-like queries. Each table is a multidimensional sparse map. Tables consist of rows and columns...
Mercurial: how to amend the last commit?
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edited Jun 20 at 9:12
Community♦
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answered May 2 '12 at 18:46
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淘宝应对双\"11\"的技术架构分析 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...据传输组件DataX、DbSync和Timetunnel准实时地传输到一个有1500个节点的Hadoop集群上，这个集群我们称之为“云梯”，是计算层的主要组成部分。在“云梯”上，我们每天有大约40000个作业对1.5PB的原始数据按照产品需求进行不同的MapR...
java.util.Date vs java.sql.Date
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590
Congratulations, you've hit my favorite pet peeve with JDBC: Date class handling.
Basically dat...
Does Swift have documentation generation support?
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+50
Documenta...
What goes into your .gitignore if you're using CocoaPods?
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Matt MowerMatt Mower
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How can I check for “undefined” in JavaScript? [duplicate]
...ar) will also include these falsy values, so it's not very robust:
false
0
""
NaN
null
undefined
Thanks to @CMS for pointing out that your third case - if (myVariable) can also throw an error in two cases. The first is when the variable hasn't been defined which throws a ReferenceError.
// abc...
Changing CSS Values with Javascript
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edited Sep 28 '12 at 15:50
Luis Perez
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answere...