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Why use AJAX when WebSockets is available?
...things that the browser already does well (caching, security, parallelism, error handling, etc). Regarding performance, although from-scratch raw large file transfer speed would be similar, browsers have had years to finely tune caching of web content (much of which applies to AJAX requests) so in p...
All falsey values in JavaScript
...}
[]
function(){} or () => {} (any function, including empty functions)
Error and any instance of Error
Any regular expression
Anything created with new (including new Number(0) and new Boolean(false))
Any Symbol
true, 1, "1" and [1] return true when compared to each other with ==.
...
Is JavaScript's “new” keyword considered harmful?
...ntime exception:
if ( !(this instanceof arguments.callee) )
throw new Error("Constructor called as a function");
(Note that this snippet is able to avoid hard-coding the constructor function name, as unlike the previous example it has no need to actually instantiate the object - therefore, it...
Rule-of-Three becomes Rule-of-Five with C++11?
...cial functions. This is good because a missing declaration turns a runtime error into a compilation error now (or at least a warning). As a C++03 compatibility measure some operations are still generated but this generation is deemed deprecated and should at least produce a warning in C++0x mode.
D...
What's the difference between “Write-Host”, “Write-Output”, or “[console]::WriteLine”?
...n Azure WebJob [console]::WriteLine works but Write-Host will result in an error: The Win32 internal error "The handle is invalid" 0x6 occurred while setting character attributes for the console output buffer. Don't ask me why.
– Gil Roitto
Nov 3 '17 at 12:19
...
Do you put unit tests in same project or another project?
...n the same project. When you build a assembly that includes unitTests, any errors in the unitTest will give you an compilereerror, so you must keep your unittest up-to-date, just to build. Having unittest in a seperate project, might cause some developers to forget building the unittest-project, and...
What are some uses of decltype(auto)?
...x6a) is std::initializer_list<int>
decltype(auto) x6d = { 1, 2 }; // error, { 1, 2 } is not an expression
auto *x7a = &i; // decltype(x7a) is int*
decltype(auto)*x7d = &i; // error, declared type is not plain decltype(auto)
...
How to get function parameter names/values dynamically?
...
Solution that is less error prone to spaces and comments would be:
var fn = function(/* whoa) */ hi, you){};
fn.toString()
.replace(/((\/\/.*$)|(\/\*[\s\S]*?\*\/)|(\s))/mg,'')
.match(/^function\s*[^\(]*\(\s*([^\)]*)\)/m)[1]
.split(/,/)
["...
Does JavaScript have “Short-circuit” evaluation?
...hort-circuit" evaluation.
if (true == true || foo.foo){
// Passes, no errors because foo isn't defined.
}
Live DEMO
if (false && foo.foo){
// Passes, no errors because foo isn't defined.
}
Live DEMO
sha...
搭建高可用mongodb集群（二）—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...
...
repset:SECONDARY> show tables;
#输出
Sun Dec 29 21:50:48.590 error: { "$err" : "not master and slaveOk=false", "code" : 13435 } at src/mongo/shell/query.js:128
#mongodb默认是从主节点读写数据的，副本节点上不允许读，需要设置副本节点可以读。
repset:S...