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CATALINA_OPTS vs JAVA_OPTS - What is the difference?
...nd JAVA_OPTS - which are both used in the catalina.sh startup and shutdown script for Tomcat. They are described in comments within that file as:
[JAVA_OPTS]: (optional) Java runtime options used when the "start", "stop" or "run"
command is executed
and
[CATALINA_OPTS]: (optional) Java ...
“Could not find bundler” error
...ct folder do:
bundle install
and then you can run your project using:
script/rails server
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Javascript when to use prototypes
...var myObject = function () {
};
myObject.prototype.getA = function (){
alert("A");
};
myObject.getB = function (){
alert("B");
};
myObject.getB(); // This works fine
myObject.getA(); // Error!
var myPrototypeCopy = new myObject();
myPrototypeCopy.getA(); // This works, too.
...
Difference between JSON.stringify and JSON.parse
...
JSON.stringify turns a JavaScript object into JSON text and stores that JSON text in a string, eg:
var my_object = { key_1: "some text", key_2: true, key_3: 5 };
var object_as_string = JSON.stringify(my_object);
// "{"key_1":"some text","key_2":tru...
Getting All Variables In Scope
...ind out what else is available by other means by doing:
var n, arg, name;
alert("typeof this = " + typeof this);
for (name in this) {
alert("this[" + name + "]=" + this[name]);
}
for (n = 0; n < arguments.length; ++n) {
arg = arguments[n];
alert("typeof arguments[" + n + "] = " + typ...
Difference between return and exit in Bash functions
...as nothing to do with exit codes. Exit codes are intended for applications/scripts, not functions. So in this regard, the only keyword that sets the exit code of the script (the one that can be caught by the calling program using the $? shell variable) is exit.
EDIT 2:
My last statement referring ...
“elseif” syntax in JavaScript
...completely equivalent if the conditions don't return booleans, e.g. if([]) alert('a') produces the alert but switch(true){case []:alert('a')} doesn't. That's because [] is a truthy value but not equal to true, as @zwol explained in this edit.
– Oriol
Mar 27 '16...
Why doesn't JavaScript have a last method? [closed]
Its kinda weird that the JavaScript Array class does not offer a last method to retrieve the last element of an array. I know the solution is simple (Ar[Ar.length-1] ), but, still, this is too frequently used.
...
What are the respective advantages/limitations of Amazon RDS vs. EC2 with MySQL? [closed]
... The other solution was to use a 3rd party tool that creates a massive SQL script (on the app server) that will recreate the schema and populate the data back to a restore point.
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C++特化模板函数的符号多重定义错误问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
...误。去下载源代码自己尝试一下吧。
如果你正在为其他开发人员写模板库，extern 方式会很不爽，因为你必须创建一个带目标模块的链接库（lib），它包含有特化。如果你已经有了一个这样的 .lib，也没什么；如果没有，你可能...