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Creating Reusable Helper Functions in React.js


Creating Reusable Helper Functions in React.js

By : ORParga ORParga
Date : November 20 2020, 03:01 PM
around this issue Helper functions should not depend on the context of the component they are called to (at least in my opinion). If you need to use some parameter in your function passing that to function is always a better practice since it helps on re-usability. The key for the state property might be different for all components and this might lead to errors if you forget to use exact key for the state property.
For Example
code :
export function passwordValidation(password) {
  const length = password.length;
  if (length > 7) return 'success';
  else if (length > 4) return 'warning';
  else if (length > 0) return 'error';
}
import { passwordValidation } from '/path/to/helper/functions.js';

console.log(passwordValidation(this.state.password));
console.log(passwordValidation(this.state.confirmPassword));
console.log(passwordValidation(this.props.password));
console.log(passwordValidation(someFetchedObject.user.password));


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Help with creating a reusable PHP function which will 'dynamically' call other functions

Help with creating a reusable PHP function which will 'dynamically' call other functions


By : user1684633
Date : March 29 2020, 07:55 AM
To fix this issue The preferred way of doing this is to use a Table Data Gateway. Instead of
code :
$this->db->insert('countries', $data);
class Countries
{
    $protected $_db;

    public function __construct($db)
    {
        $this->_db = $db;
    }

    public function save(array $countries)
    {
        $this->db->insert('countries', $countries);
    }

    // ... other methods
}
$this->db->startTransaction();          // like try/catch for databases
$countries = new Countries($this->db);
$countries->save($countryData);
$links = new Links($this->db);
$links->save($linkData);
// ...
if($this->db->commit() === false) {     // returns true when no errors occured
    $this->db->rollback();              // undos in case something went wrong
}
Codeception + Reusable utility helper functions

Codeception + Reusable utility helper functions


By : S McMaster
Date : March 29 2020, 07:55 AM
it helps some times All methods of $I are steps and so they are printed in the steps output.
The only way to hide helper function is to call it from another helper function which looks better in the steps output.
Creating and calling helper / reusable functions

Creating and calling helper / reusable functions


By : Bill
Date : March 29 2020, 07:55 AM
like below fixes the issue Here is my code, simply I am retrieving an array from the back end, and displaying in a select element, and just checking if an attribute is true then I show an input of expiry date, else I hide it this is working code...all I need to do is just simplify, just need to create 2 helper/ reusable functions so I can call them ... because as you can see, there is repetitive code...
code :
$(document).ready(function() {

    function showHide(item) {
        if(item.expires) {
           $('#expiryDate_input').show();
        }   
        else {
           $('#expiryDate_input').hide();
        }
    }
    function search(id) {
        for (i=0; i < allItems.length; i++)   {
            var arrayItemId = allItems[i].id;
            if (id == arrayItemId){
                showHide( allItems[i]);
            }         
        }
    }
    $('#expiryDate_input').hide();

        var allItems = {!! json_encode($items->toArray()) !!};
        var arrayItemId = $('#item').val();
        search(arrayItemId);
    }

    $("#item").change(function() {

        var currentItemId = $(this).val();
        if (currentItemId == '') {
            $('#expiryDate_input').hide();
        }
        search(currentItemId);
    });
});
Ways of creating reusable header with react

Ways of creating reusable header with react


By : markgoho
Date : March 29 2020, 07:55 AM
Hope this helps You can create a Header component and pass dynamically to every component where needed by values.
Header.js
code :
function Header({title,menus_json,logo_path,admin}){
return (
   <header>
    // use your title,menus_json,logo_path,admin
   </header>
 )
}
function Component1(){
    return (
       <div>
        <Header title="title" logo_path=[] admin=False
         menus_json=[{'title':'tab1', 'route_path'='/tab1'}] />
        <div>...</div>
       </div>
      )
    }
function Component2(){
        return (
           <div>
            <Header title="title2" logo_path=[] admin=False
             menus_json=[{'title':'tab2', 'route_path'='/tab2'}] />
            <div>...</div>
           </div>
          )
        }
React.js : reusable components vs mixin's utility functions

React.js : reusable components vs mixin's utility functions


By : Mahesh Shimpi
Date : March 29 2020, 07:55 AM
To fix the issue you can do One aspect is performance: if you write a component to display the date like you did above, you can mark it with PureRenderMixin, as the rendered output relies only on the the props. This might speed up the rendering a bit, as the formatting only needs to be done when the date changes.
From clean code point of view, I would either write a component or use a non-react utility function that just formats the date to a string - no need to couple the date formatting and dom elements. Something like:
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