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How to check variable is null or undefined?

Post author By Mubarak Hossain
Post date May 5, 2023

To check for null or undefined in TypeScript, use a comparison to check if the value is equal or is not equal to null or undefined.

Check example below:

// check val variable value
if(typeof val=='undefined' || val=="" || val==null){
	// null
} else {
	// not null
}

How to filter numeric value and remove if 1st character is zero?

Post author By Mubarak Hossain
Post date May 5, 2023

In below example will see how to filter numeric value (1-9) and remove all unnecessary characters and if 1st character is zero from a string by using regular expression and charAt method.

// My string variable
const myString = '0171D82d584';

// We filtered and exclude characters and 1st 0 form a string
const filteredString = myString.replace(/[^0-9]/g, '');
while(filteredString.charAt(0)===0)
{
	filteredString = filteredString.substring(1);
}
console.log('Result:', filteredString);

// Output results
// Result: 17182584

How to filter numeric value and remove all unnecessary characters?

Post author By Mubarak Hossain
Post date May 5, 2023

In below example will see how to filter numeric value (0-9) and remove all unnecessary characters from a string by using regular expression.

// My string variable
const myString = '0171D82d584';

// We filtered and exclude characters form a string
const filteredString = myString.replace(/[^0-9]/g, '');
console.log('Numeric Value:', filteredString);

// Output results
// Numeric Value: 017182584

How to loop an array of objects and print some key value?

Post author By Mubarak Hossain
Post date May 5, 2023

I used the map() method to iterate over the array of object. In objectItems has some array of object items. In below example will see how to map an array of objects and iterate over the array of object and write console log product ID and product Name by using TypeScript or Javascript.

// My data object
const objectItems = [
	{productId: 1, productName: 'Porduct 01'},
	{productId: 2, productName: 'Porduct 02'},
	{productId: 3, productName: 'Porduct 03'}
];

// We filtered and exclude third item form object
objectItems.map((item, index)=>{
	console.log('ProductId:', item.productId);
	console.log('ProductName:', item.productName);
});

// Output results
/*
ProductId: 1
ProductName: Porduct 01

ProductId: 2
ProductName: Porduct 02

ProductId: 3
ProductName: Porduct 03
*/

How to filter an array of objects in TypeScript?

Post author By Mubarak Hossain
Post date May 5, 2023

I used the filter() method to iterate over the array of object. In objectItems has some array of object items. I have iterate over the array and checked & compaire eventId & productId, if eventId not equal 3 & productId not equal 8 in object objectItems meets those conditions.

// My data object
const objectItems = [
	{eventId: 1, productId: 6, productName: 'Porduct 01'},
	{eventId: 2, productId: 7, productName: 'Porduct 02'},
	{eventId: 3, productId: 8, productName: 'Porduct 03'},
	{eventId: 4, productId: 9, productName: 'Porduct 04'},
	{eventId: 5, productId: 10, productName: 'Porduct 05'},
	{eventId: 6, productId: 11, productName: 'Porduct 06'}
];

// We filtered and exclude third item form object
const filteredObjectItems = objectItems.filter(function( obj ) {
	return (obj.eventId !== 3 && obj.productId !== 8);
});

// Filtered object return Output
[
	{eventId: 1, productId: 6, productName: 'Porduct 01'},
	{eventId: 2, productId: 7, productName: 'Porduct 02'},
	{eventId: 4, productId: 9, productName: 'Porduct 04'},
	{eventId: 5, productId: 10, productName: 'Porduct 05'},
	{eventId: 6, productId: 11, productName: 'Porduct 06'}
];

How to check an Object if value exists JavaScript?

Post author By Mubarak Hossain
Post date May 5, 2023

In objectItems variable has some array of items. I have checked and compaire productId exists and productId equal 2 in object objectItems?

const objectItems = [
	{productId: 1, productName: 'Porduct 01'},
	{productId: 2, productName: 'Porduct 02'},
	{productId: 3, productName: 'Porduct 03'}
];

if(objectItems.some(obj => obj.productId == 2)){
	// Yes, satisfied
} else {
	// No, not satisfied
}

How to check an Object if multiple value exists in Object items?

Post author By Mubarak Hossain
Post date May 5, 2023

This is work for me. Here in objectItems has some array of object items. I have checked and compaire eventId and productId exists and eventId equal 5 & productId equal 10 in object objectItems?

const objectItems = [
	{eventId: 1, productId: 6, productName: 'Porduct 01'},
	{eventId: 2, productId: 7, productName: 'Porduct 02'},
	{eventId: 3, productId: 8, productName: 'Porduct 03'},
	{eventId: 4, productId: 9, productName: 'Porduct 04'},
	{eventId: 5, productId: 10, productName: 'Porduct 05'},
	{eventId: 6, productId: 11, productName: 'Porduct 06'}
];

if(objectItems.some(obj => obj.eventId == 5 && obj.productId == 10)){
	// Yes, satisfied
} else {
	// No, not satisfied
}

Laravel migration syntax error access violation 1071 specified key was too long

Post author By Mubarak Hossain
Post date January 10, 2023

Laravel migration syntax error,

SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long; max key length is 1000 bytes (SQL: alter table `personal_access_tokens` add index `personal_access_tokens_tokenable_type_tokenable_id_index`(`tokenable_type`, `tokenable_id`))

What worked for me was editing the config/database.php file in config directory.

Edit:

'charset' => 'utf8mb4',
'collation' => 'utf8mb4_unicode_ci',

To:

'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',

I did it with Laravel 9.x

How to add line break in Whatsapp text message using javascript?

Post author By Mubarak Hossain
Post date August 23, 2022

Sending messages is quick with the Enter key. But you can also added line break at WhatsApp text message via the API using window.open request, we show here.

Please create your message string with “%0a” where you want to add line break.

$(document).on('click', '.btn-send-message', function(event){
	event.preventDefault();
	var mobileNumber = '+8801719316663';
	var messageString = "Hi, %0aI want to talk with you about my web or app development.%0aPlease help me!!";
	let openUrl = "whatsapp://send?text=" + messageString + "&phone=" + mobileNumber;
	window.open(openUrl, '_self');
});

i18next::pluralResolver: Your environment seems not to be Intl API compatible

Post author By Mubarak Hossain
Post date March 12, 2022

i18next::pluralResolver: Your environment seems not to be Intl API compatible, use an Intl.PluralRules polyfill. Will fallback to the compatibilityJSON v3 format handling.

Solution:

Just modifyed your i18n.js file and add “compatibilityJSON: ‘v3’” on init mathod.

import i18next from 'i18next';
import english from '../languages/en.json';
import bangla from '../languages/bn.json';

import { initReactI18next } from 'react-i18next';

i18next.use(initReactI18next).init({
    compatibilityJSON: 'v3', //Add this line
    lng: 'en',
    resources: {
        en: english,
        bn: bangla
    },
    react: {
        useSuspense: false
    },
});

export default i18next;

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