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Trending in Stackoverflow

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Date: 2017-10-23

  1. ANTLR: Is there a simple example?

    tags: java, antlr, antlr4, antlr3

    186 votes, 3 answers and 104185 views

    \r\n I'd like to get started with ANTLR, but after spending a few hours reviewing the examples at the antlr.org site, I still can't get a clear understanding of the grammar to Java process.\n\nIs there some ...\r\n

  2. Add a reference column migration in Rails 4

    tags: ruby-on-rails, ruby-on-rails-4, rails-activerecord, rails-migrations

    181 votes, 4 answers and 126485 views

    \r\n A user has many uploads. I want to add a column to the uploads table that references the user. What should the migration look like? \n\nHere is what I have. I'm not sure if I should use (1) :user_id, :...\r\n

  3. How can I add new array elements at the beginning of an array in JavaScript?

    tags: javascript, arrays

    905 votes, 7 answers and 403575 views

    \r\n I have a need to add or prepend elements at the beginning of an array.\n\nFor example, if my array looks like below:\n\n[23, 45, 12, 67]\r\nAnd the response from my AJAX call is 34, I want the updated array ...\r\n

  4. What is the “continue” keyword and how does it work in Java?

    tags: java, keyword, continue

    232 votes, 8 answers and 378214 views

    \r\n I saw this keyword for the first time and I was wondering if someone could explain to me what it does.\r\nWhat is the continue keyword?\nHow does it work?\nWhen is it used?\r\n

  5. The use of Swift 3 @objc inference in Swift 4 mode is deprecated?

    tags: swift, swift4, xcode9-beta

    219 votes, 6 answers and 28156 views

    \r\n Briefly, while using Xcode 9 Beta, I have run into the following warning:\r\n The use of Swift 3 @objc inference in Swift 4 mode is deprecated. Please address deprecated @objc inference warnings, test ...\r\n

  6. How do I manage MongoDB connections in a Node.js web application?

    tags: node.js, mongodb, database-connection, connection-pooling

    182 votes, 8 answers and 59143 views

    \r\n I'm using the node-mongodb-native driver with MongoDB to write a website.\n\nI have some questions about how to manage connections:\r\nIs it enough using only one MongoDB connection for all requests? Are ...\r\n

  7. Is it possible to define more than one function per file in MATLAB, and access them from outside that file?

    tags: matlab, function, file, scope, function-declaration

    183 votes, 8 answers and 85758 views

    \r\n When I was studying for my undergraduate degree in EE, MATLAB required each function to be defined in its own file, even if it was a one-liner.\n\nI'm studying for a graduate degree now, and I have to ...\r\n

  8. Do I commit the package-lock.json file created by npm 5?

    tags: node.js, git, npm, version-control, lockfile

    196 votes, 3 answers and 41299 views

    \r\n npm 5 was released today and one of the new features include deterministic installs with the creation of a package-lock.json file.\n\nIs this file supposed to be kept in source control?\n\nI'm assuming it'...\r\n

  9. Optimal number of threads per core

    tags: parallel-processing, cpu

    203 votes, 13 answers and 127549 views

    \r\n Let's say I have a 4-core CPU, and I want to run some process in the minimum amount of time. The process is ideally parallelizable, so I can run chunks of it on an infinite number of threads and each ...\r\n

  10. How do you perform wireless debugging in Xcode 9 with iOS 11, Apple TV 4K, etc?

    tags: ios, xcode, debugging, ios11, xcode9

    197 votes, 11 answers and 37653 views

    \r\n Wireless debugging was recently added as a feature in Xcode 9, iOS 11, and tvOS 11. Apple TV 4K doesn't have a USB port, so it requires wireless debugging. How do you perform this wireless debugging ...\r\n