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记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
记一次MongoDB性能问题最近忙着把一个项目从MySQL迁移到MongoDB，在导入旧数据的过程中，遇到了些许波折，犯了不少错误，但同时也学到了不少知识，遂记录下来。公...最近忙着把一个项目从MySQL迁移到MongoDB，在导入旧数据的过...
Angular JS break ForEach
...sion.
JSFiddle:
http://jsfiddle.net/JEcD2/1/
Javascript:
var array = ['foo', 'bar', 'yay'];
$.each(array, function(index, element){
if (element === 'foo') {
return true; // continue
}
console.log(this);
if (element === 'bar') {
return false; // break
}
});
N...
Which way is best for creating an object in JavaScript? Is `var` necessary before an object property
... the inheritance more obvious.
Creating an object literal (ex: var obj = {foo: "bar"};) works great if you happen to have all the properties you wish to set on hand at creation time.
For setting properties later, the NewObject.property1 syntax is generally preferable to NewObject['property1'] if y...
Is there any way to git checkout previous branch?
...e equivalent of cd - for git. If I am in branch master and I checkout foo , I would love to be able to type something like git checkout - to go back to master , and be able to type it again to return to foo .
...
Logical Operators, || or OR?
...
and $e = true || $x = 'foo' will not define $x because of short-circuiting, not because of higher precedence.
– Matt Kieran
Jul 31 '14 at 1:18
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Install a module using pip for specific python version
...hon version you want to install the package for:
python2.7 -m pip install foo
share
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Add a default value to a column through a migration
...ng defaults for existing records. For example: def change ` add_column :foos, :name, default: "something for existing values"` ` change_column_default :foos, :name, default: ""` end
– user1491929
Jan 4 '16 at 16:14
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Learning about LINQ [closed]
One of the things I've asked a lot about on this site is LINQ . The questions I've asked have been wide and varied and often don't have much context behind them. So in an attempt to consolidate the knowledge I've acquired on Linq I'm posting this question with a view to maintaining and updating it ...
Convert command line arguments into an array in Bash
...rameters for the scope. It also lets you set shell options. You can do set foo, which will mean $1 expands to "foo", but if your parameters start with a dash set will assume you mean to set a shell option. The double-dash ensures that all the following parameters are interpreted as positional parame...
Breaking out of nested loops [duplicate]
... return statement can be used to exit the outermost loop at any time.
def foo():
for x in range(10):
for y in range(10):
print(x*y)
if x*y > 50:
return
foo()
If it's hard to extract that function you could use an inner function, as @bjd2385 s...