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2017-10-21.md

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Trending in Stackoverflow

See what the Stackoverflow community is most excited about today.

Date: 2017-10-21

  1. Key existence check in HashMap

    tags: java, hashmap

    208 votes, 9 answers and 281372 views

    \r\n Is checking for key existence in HashMap always necessary?\n\nI have a HashMap with say a 1000 entries and I am looking at improving the efficiency.\nIf the HashMap is being accessed very frequently, ...\r\n

  2. node.js require() cache - possible to invalidate?

    tags: node.js

    224 votes, 13 answers and 85603 views

    \r\n From the node.js documentation:\r\n Modules are cached after the first time they are loaded. This means (among other things) that every call to require('foo') will get exactly the same object returned, ...\r\n

  3. How to clone git repository with specific revision/changeset?

    tags: git, git-clone, revision

    224 votes, 11 answers and 268810 views

    \r\n How can I clone git repository with specific revision, something like I usually do in Mercurial:\n\nhg clone -r 3 /path/to/repository\r\n

  4. How to mkdir only if a dir does not already exist?

    tags: shell, scripting, ksh, aix, mkdir

    1071 votes, 11 answers and 606189 views

    \r\n I am writing a shell script to run under the KornShell (ksh) on AIX. I would like to use the mkdir command to create a directory. But the directory may already exist, in which case I do not want to do ...\r\n

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

    tags: ios, xcode, debugging, ios11, xcode9

    194 votes, 11 answers and 36928 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

  6. Visual Studio 2017 error: Unable to start program, An operation is not legal in the current state

    tags: asp.net, asp.net-core, visual-studio-2017

    181 votes, 10 answers and 44921 views

    \r\n After fresh installation of Visual Studio 2017 I tried to run .NET Core Web project and when trying to run it on Chrome I am getting this error:\r\n Unable to start program, An operation is not legal ...\r\n

  7. restrict edittext to single line

    tags: android, android-edittext

    191 votes, 20 answers and 167411 views

    \r\n possible duplicate : android-singleline-true-not-working-for-edittext\n\n<EditText \n android:id="@+id/searchbox" \n android:layout_width="fill_parent"\n android:layout_height="wrap_content"\n ...\r\n

  8. How to do paging in AngularJS?

    tags: angularjs, pagination

    222 votes, 20 answers and 368795 views

    \r\n I have a dataset of about 1000 items in-memory and am attempting to create a pager for\nthis dataset, but I'm not sure on how to do this.\n\nI'm using a custom filter function to filter the results, and ...\r\n

  9. How to obtain the number of CPUs/cores in Linux from the command line?

    tags: linux, bash, cpu

    223 votes, 13 answers and 192823 views

    \r\n I have this script, but I do not know how to get the last element in the printout:\n\ncat /proc/cpuinfo | awk '/^processor/{print $3}'\r\nThe last element should be the number of CPUs, minus 1.\r\n

  10. Disable link using css

    tags: html, css

    666 votes, 15 answers and 865988 views

    \r\n Is there any way to disable a link using CSS?\n\nI have a class called current-page and want links with this class to be disabled so that no action occurs when they are clicked.\r\n