In Ruby, how do I check if method “foo=()” is defined?

The problem is that the foo= method is designed to be used in assignments. You can use defined? in the following way to see what’s going on: defined?(self.foo=()) #=> nil defined?(self.foo = “bar”) #=> nil def foo=(bar) end defined?(self.foo=()) #=> “assignment” defined?(self.foo = “bar”) #=> “assignment” Compare that to: def foo end defined?(foo) #=> “method” … Read more

Unexpected token < in first line of HTML

Your page references a Javascript file at /Client/public/core.js. This file probably can’t be found, producing either the website’s frontpage or an HTML error page instead. This is a pretty common issue for eg. websites running on an Apache server where paths are redirected by default to index.php. If that’s the case, make sure you replace … Read more

Laravel: Error [PDOException]: Could not Find Driver in PostgreSQL

Be sure to configure the ‘default’ key in app/config/database.php For postgres, this would be ‘default’ => ‘postgres’, If you are receiving a [PDOException] could not find driver error, check to see if you have the correct PHP extensions installed. You need pdo_pgsql.so and pgsql.so installed and enabled. Instructions on how to do this vary between … Read more

Babel unexpected token import when running mocha tests

For Babel <6 The easiest way to solve this problem is: npm install babel-preset-es2015 –save-dev Add .babelrc to the root of the project with contents: { “presets”: [ “es2015″ ] } Ensure that you are running mocha with the “–compilers js:babel-core/register” parameter. For Babel6/7+ npm install @babel/preset-env –save-dev Add .babelrc to the root of the … Read more

Uncaught SyntaxError: Unexpected token u in JSON at position 0

Try this in the console: JSON.parse(undefined) Here is what you will get: Uncaught SyntaxError: Unexpected token u in JSON at position 0 at JSON.parse (<anonymous>) at <anonymous>:1:6 In other words, your app is attempting to parse undefined, which is not valid JSON. There are two common causes for this. The first is that you may … Read more

Syntax Error: Not a Chance – What is this error?

You have found an easter egg in Python. It is a joke. It means that delimiting blocks by braces instead of indentation will never be implemented. Normally, imports from the special __future__ module enable features that are backwards-incompatible, such as the print() function, or true division. So the line from __future__ import braces is taken … Read more