36 thoughts on “Today I Learned (TIL)”

  1. react-router > V5 useHistory hook:
    If you have React >= 16.8 and functional components you can use the useHistory hook from react-router.

    import React from 'react';
    import { useHistory } from 'react-router-dom';

    const YourComponent = () => {
    const history = useHistory();

    const handleClick = () => {
    history.push("/path/to/push");
    }

    return (

    );
    }

    export default YourComponent;

    https://stackoverflow.com/a/40380010

  2. VSC PowerShell. After npm updating packages .ps1 cannot be loaded because running scripts is disabled on this system

    This is a powershell security policy, to fix it run the following

    PS C:\> Set-ExecutionPolicy RemoteSigned
    The stricter the policy, the more secure your system becomes.

    You can change RemoteSigned to other options like: Restricted, AllSigned, RemoteSigned, Unrestricted

    https://stackoverflow.com/a/57675039

  3. object key by variable
    You need to make the object first, then use [] to set it.

    var key = "happyCount";
    var obj = {};
    obj[key] = someValueArray;
    myArray.push(obj);

    UPDATE 2018:

    If you’re able to use ES6 and Babel, you can use this new feature:

    {
    [yourKeyVariable]: someValueArray,
    }

  4. Allowing node.js applications to run on port 80
    in order to avoid this error, you can resolve the non-symlink executable with which node, as full example:

    sudo apt-get install libcap2-bin
    sudo setcap cap_net_bind_service=+ep `readlink -f \`which node\``

    the “which” command shows the full path of shell commands.
    https://serverfault.com/a/731341

  5. How to open Visual Studio Code from the command line on OSX?
    Tip: If you want to run VS Code from the terminal by simply typing ‘code’, VS Code has a command, Shell Command: Install ‘code’ command in PATH, to add ‘code’ to your $PATH variable list.

    After installation, launch VS Code. Now open the Command Palette (F1 or ⇧+⌘+P on Mac) and type shell command to find the Shell Command: Install ‘code’ command in PATH command.

    After executing the command, restart the terminal for the new $PATH value to take effect. You’ll be able to simply type ‘code .’ in any folder to start editing files in that folder.

    https://stackoverflow.com/a/29971430

  6. How to copy code from Visual Studio to MS Word with EVERY highlight exactly as it is?

    So I was looking for an answer to this and this is what i found. Go to Extensions (manager) -> look for: Productivity Power Tools -> install & restart VS. Now when i copy/paste from VS to Word, literally all syntax colors are being copied over 1:1. even the background color is matched.

    I use VS 2019 preview these days.

    https://stackoverflow.com/a/55211462

  7. I have never worked with firebase. However i’m 99% sure that your dictionary should be

    Dictionary <string, object > or Dictionary<string, System.Object>

    instead of

    Dictionary<string, Object> which actually is Dictionary<string, UnityEngine.Object>

    Keep in mind that the compiler will use classes from the namespaces you are “using”. There is no “Object” class in the global namespace. Since most Unity scripts have a using UnityEngine; at the top, “Object” will refer to UnityEngine.Object.

    The C# base class for every type (System.Object) has an alias name in the global namespace: object. Note the lower case “o”. There are several alias names for built-in fundamental types, like string (System.String), int (System.Int32), long (System.Int64), ...

    http://answers.unity.com/comments/1560625/view.html

  8. Functional programming:
    1. Keep data immutable
    2. Keep functions pure-accept at least one argument, return data or another function.
    3. Use recursion over looping.

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