error-handling

来源： https://stackoverflow.com/questions/60212576/how-do-i-write-a-clojure-threading-macro

问题 I am implementing a node + express js app, and I am having issues calling to the next function into the error handler. I have a render middleware which is called by next in each each controler, and I would like it to be the same with my error handler. What I do in controler is putting some viewProperties in the req and then call the next middleware which retrieve these properties and render the response consequently. function render(req, res, next) { // viewName, title, args var properties =

问题 I found the following code in a project, that I do not understand.: get(key, store = null) { if (!key) { return new Error('There is no key to get!'); } let dbstore = this.localforage; if (store !== null) { dbstore = store; } return dbstore .getItem(key) .then(function(value) { return value; }) .catch(function(err) { return new Error('The key (' + key + ") isn't accessible: " + err); }); } Why return new Error('There is no key to get!'); instead of throw new Error('There is no key to get!'); ?

问题 I found the following code in a project, that I do not understand.: get(key, store = null) { if (!key) { return new Error('There is no key to get!'); } let dbstore = this.localforage; if (store !== null) { dbstore = store; } return dbstore .getItem(key) .then(function(value) { return value; }) .catch(function(err) { return new Error('The key (' + key + ") isn't accessible: " + err); }); } Why return new Error('There is no key to get!'); instead of throw new Error('There is no key to get!'); ?

问题 I am writing in Python 2.7 and encounter the following situation. I would like to try calling a function three times. If all three times raise errors, I will raise the last error I get. If any one of the calls succeed, I will quit trying and continue immediately. Here is what I have right now: output = None error = None for _e in range(3): error = None try: print 'trial %d!' % (_e + 1) output = trial_function() except Exception as e: error = e if error is None: break if error is not None:

问题 I'm new to Node.js. I tried to add RethinkDB module to my project, but I got: npm error:0909006C:PEM routines:get_name:no start line error. I don't use a proxy, tried uninstalling/reinstalling Node.js, and changing the registry from the solutions I found online, but none of them worked. 回答1: type this line npm set registry http://registry.npmjs.org/ and after that try again I assume that your certificate is expired 回答2: that what solved for me on windows , cmd: ssh-keygen -t rsa -b 4096 -m

问题 I have a .bat script that attempts to start a Windows service at the end. :start_wildfly echo. set /p wildfly_service_name="Enter Wildfly service name: " echo INFO: Starting %wildfly_service_name%... echo. call net start "%wildfly_service_name%" I want to be able to interpret the result of the net start attempt so that I can have my script take the appropriate action if it fails (e.g. if the service is already running, restart it. If the service name is invalid, re-prompt for the name again,

问题 I have a .bat script that attempts to start a Windows service at the end. :start_wildfly echo. set /p wildfly_service_name="Enter Wildfly service name: " echo INFO: Starting %wildfly_service_name%... echo. call net start "%wildfly_service_name%" I want to be able to interpret the result of the net start attempt so that I can have my script take the appropriate action if it fails (e.g. if the service is already running, restart it. If the service name is invalid, re-prompt for the name again,

问题 I'm doing an API call on a system and am receiving this error. I can get a response with curl and Postman with the same URL, but safari throws this error when using Angular's $http.get() method. This will also work in production. The error only occurs during development. Searching this error turns up similar, but different questions. 回答1: I found out that this error is actually a X-origin issue. If you are only experiencing this during Dev, in Safari, just disable X-origin restrictions in the

问题 I'm doing an API call on a system and am receiving this error. I can get a response with curl and Postman with the same URL, but safari throws this error when using Angular's $http.get() method. This will also work in production. The error only occurs during development. Searching this error turns up similar, but different questions. 回答1: I found out that this error is actually a X-origin issue. If you are only experiencing this during Dev, in Safari, just disable X-origin restrictions in the