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How do you use the ? : (conditional) operator in JavaScript?
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This is a one-line shorthand for an if-else statement. It's called the conditional operator.1
Here is an example of code that could be shortened with the conditional operator:
var userType;
if (userIsYoungerThan18) {
userType = "Minor";
} else {
userType = "Adult";
}
if (userIsY...
When to use MyISAM and InnoDB? [duplicate]
...s much less costs of server resources. -- Mostly no longer true.
Full-text indexing. -- InnoDB has it now
Especially good for read-intensive (select) tables. -- Mostly no longer true.
Disk footprint is 2x-3x less than InnoDB's. -- As of Version 5.7, this is perhaps the only real advantage of MyISA...
Creating a new empty branch for a new project
...uld be used:
git symbolic-ref HEAD refs/heads/<newbranch>
rm .git/index
git clean -fdx
After doing some work:
git add -A
git commit -m <message>
git push origin <newbranch>
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What's the difference between git reset --mixed, --soft, and --hard?
...nstaged. In order to commit it, you must stage it—that is, add it to the index—using git add. When you make a commit, the changes that are committed are those that have been added to the index.
git reset changes, at minimum, where the current branch (HEAD) is pointing. The difference between --...
20个命令行工具监控 Linux 系统性能 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...金 OISF（Open Information Security Foundation）拥有的。
17. VnStat PHP — 监测网络带宽
VnStat PHP 是一个 web 前端应用最流行的社交工具叫“vnstat”。 VnStat PHP 使用了很好的图形模式监控网络流量的使用情况。它显示了每时、每天、每月的...
How to get the instance id from within an ec2 instance?
...vation id
--ami-id display the ami id
--ami-launch-index display the ami launch index
--ami-manifest-path display the ami manifest path
--ancestor-ami-ids display the ami ancestor id
--product-codes display the ami associated product codes
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Passing arrays as parameters in bash
...call.
The ! in ${!1} expands the arg 1 variable.
declare -a just makes the indexed array explicit, it is not strictly necessary.
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How to create a unique index on a NULL column?
...tp://sqlservercodebook.blogspot.com/2008/04/multiple-null-values-in-unique-index-in.html
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How can I do an asc and desc sort using underscore.js?
... charCodeAt will "return the Unicode of the character at the specified index in a string" so it can be used to sort by characters in a string, but as shown it does not "sort by string" it sorts by a character in the string
– Anthony
May 22 '14 at 10:56
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mongoDB/mongoose: unique if not null
...s without the field by setting the sparse option to true when defining the index. As in:
email : {type: String, trim: true, index: true, unique: true, sparse: true}
Or in the shell:
db.users.ensureIndex({email: 1}, {unique: true, sparse: true});
Note that a unique, sparse index still does not...