Snigdha Paul

Snigdha Paul February 15, 2025 No Comments

How to create nullable variable in Dart programming language?

There are two ways to create nullable variable. 1) Using var keyword, Syntax : var variable_name;2) Using datatypeSyntax : int? variable_name; Nullable variable creation using…

Snigdha Paul February 8, 2025 No Comments

How to declare variables in Dart programming language?

There are two ways to declare variables in dart language.1st: Using ‘var‘ keyword.2nd: Writing the datatype as a prefix. // Using var keyword main(){ var…

Snigdha Paul January 18, 2025 No Comments

How to set username and email , and check these in git bash?

1st set username using git bash git config user.name "Abc" 2nd set email using git bash git config user.email "abc@mail.com" 1st check username using git…

Snigdha Paul January 18, 2025 No Comments

How to write lambda function in python programming?

We use lambda keyword for creating lambda function.Syntax : lambda parameter1,parameter2,..:expression We have to write single expression in lambda function. Lets see some examples 1st…

Snigdha Paul January 4, 2025 No Comments

How to check a pattern without case sensitivity only for one portion in a string?

We will add (?i) for matching a specific portion of a string in case insensitive way. Let’s see an example –We have one string below…

Snigdha Paul December 28, 2024 No Comments

What is the use of $1, $2, … etc in regex?

$1, $2 refers the capturing groups. $1 means first capturing group$2 means first capturing group…. etc.These are mainly used for replacement. Lets see an exampleWe…

Snigdha Paul December 21, 2024 No Comments

What is the difference between (?=) and (?<=) in regex?

(?=) is used to check if a string (which we want to match) is followed by another string or not.(?<=) is used to check if…

Snigdha Paul December 14, 2024 No Comments

How to match a pattern which must be preceded by a specific string?

Lets see with an example : We want to search a string “final” which must be preceded by “semi“. Here is two strings below:finalsemifinal Regex…

Snigdha Paul December 7, 2024 No Comments

Why we use (?<!…) instead of (?!…) while matching a pattern which should not be preceded by a specific pattern?

Lets see through example. We have two strings below ,Out First is Hello World. How is it?Out First is Hi World. How is it?I want…

Snigdha Paul November 30, 2024 No Comments

How to check if an html element exists or not using jQuery?

We can check an html element’s existence through checking its length. If length is greater than 0 that means element exist and if 0 that…

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