Top 100 Interview questions for web developer || full stack developer.

What is TypeScript?

What is TypeScript?

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2024-09-09 last updatedFreeTypescript

TypeScript is a statically typed language that builds on JavaScript by adding optional types. It allows developers to catch errors at compile time rather than runtime, which can help improve code quality and readability. TypeScript code is transpiled to JavaScript, making it compatible with existing JavaScript codebases and environments.

TypeScript is a statically typed language that builds on JavaScript by adding optional types. It allows developers to catch errors at compile time rather than runtime, which can help improve code quality and readability. TypeScript code is transpiled to JavaScript, making it compatible with existing JavaScript codebases and environments.

TypeScript is a statically typed language that builds on JavaScript by adding optional types. It allows developers to catch errors at compile time rather than runtime, which can help improve code quality and readability. TypeScript code is transpiled to JavaScript, making it compatible with existing JavaScript codebases and environments.

TypeScript is a statically typed language that builds on JavaScript by adding optional types. It allows developers to catch errors at compile time rather than runtime, which can help improve code quality and readability. TypeScript code is transpiled to JavaScript, making it compatible with existing JavaScript codebases and environments.

How do you use Vue.js with TypeScript?

How do you use Vue.js with TypeScript?

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2024-09-10 last updatedFreeVueJs

To use Vue.js with TypeScript, you need to set up a project with TypeScript support and configure Vue components to work with TypeScript. This involves installing TypeScript and related Vue typings, configuring `tsconfig.json`, and using `.ts` or `.tsx` files for your components. Vue CLI provides an option to set up a project with TypeScript support. In Vue components, you can use TypeScript for type-checking props, data, methods, and computed properties, improving code quality and maintainability.

To use Vue.js with TypeScript, you need to set up a project with TypeScript support and configure Vue components to work with TypeScript. This involves installing TypeScript and related Vue typings, configuring `tsconfig.json`, and using `.ts` or `.tsx` files for your components. Vue CLI provides an option to set up a project with TypeScript support. In Vue components, you can use TypeScript for type-checking props, data, methods, and computed properties, improving code quality and maintainability.

To use Vue.js with TypeScript, you need to set up a project with TypeScript support and configure Vue components to work with TypeScript. This involves installing TypeScript and related Vue typings, configuring `tsconfig.json`, and using `.ts` or `.tsx` files for your components. Vue CLI provides an option to set up a project with TypeScript support. In Vue components, you can use TypeScript for type-checking props, data, methods, and computed properties, improving code quality and maintainability.

To use Vue.js with TypeScript, you need to set up a project with TypeScript support and configure Vue components to work with TypeScript. This involves installing TypeScript and related Vue typings, configuring `tsconfig.json`, and using `.ts` or `.tsx` files for your components. Vue CLI provides an option to set up a project with TypeScript support. In Vue components, you can use TypeScript for type-checking props, data, methods, and computed properties, improving code quality and maintainability.

What are PHP data types?

What are PHP data types?

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2024-09-10 last updatedFreePhp

PHP supports several data types including: 1) **Integers** (e.g., `42`), 2) **Floats** (e.g., `3.14`), 3) **Strings** (e.g., `'Hello'`), 4) **Booleans** (`true` or `false`), 5) **Arrays** (e.g., `array('apple', 'banana')`), 6) **Objects** (instances of classes), 7) **NULL** (represents no value). PHP is a loosely-typed language, meaning that variables can change types based on the context.

PHP supports several data types including: 1) **Integers** (e.g., `42`), 2) **Floats** (e.g., `3.14`), 3) **Strings** (e.g., `'Hello'`), 4) **Booleans** (`true` or `false`), 5) **Arrays** (e.g., `array('apple', 'banana')`), 6) **Objects** (instances of classes), 7) **NULL** (represents no value). PHP is a loosely-typed language, meaning that variables can change types based on the context.

PHP supports several data types including: 1) **Integers** (e.g., `42`), 2) **Floats** (e.g., `3.14`), 3) **Strings** (e.g., `'Hello'`), 4) **Booleans** (`true` or `false`), 5) **Arrays** (e.g., `array('apple', 'banana')`), 6) **Objects** (instances of classes), 7) **NULL** (represents no value). PHP is a loosely-typed language, meaning that variables can change types based on the context.

PHP supports several data types including: 1) **Integers** (e.g., `42`), 2) **Floats** (e.g., `3.14`), 3) **Strings** (e.g., `'Hello'`), 4) **Booleans** (`true` or `false`), 5) **Arrays** (e.g., `array('apple', 'banana')`), 6) **Objects** (instances of classes), 7) **NULL** (represents no value). PHP is a loosely-typed language, meaning that variables can change types based on the context.

Invalid Content-Type

Invalid Content-Type

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2024-09-10 last updatedFreeError

An Invalid Content-Type error occurs when the Content-Type header in a request does not match the expected type, such as sending JSON data with an incorrect Content-Type. Ensure that the Content-Type header is correctly set to match the request payload and validate it on the server side to handle data appropriately.

An Invalid Content-Type error occurs when the Content-Type header in a request does not match the expected type, such as sending JSON data with an incorrect Content-Type. Ensure that the Content-Type header is correctly set to match the request payload and validate it on the server side to handle data appropriately.

An Invalid Content-Type error occurs when the Content-Type header in a request does not match the expected type, such as sending JSON data with an incorrect Content-Type. Ensure that the Content-Type header is correctly set to match the request payload and validate it on the server side to handle data appropriately.

An Invalid Content-Type error occurs when the Content-Type header in a request does not match the expected type, such as sending JSON data with an incorrect Content-Type. Ensure that the Content-Type header is correctly set to match the request payload and validate it on the server side to handle data appropriately.

What is the difference between `INNER JOIN` and `LEFT JOIN`?

What is the difference between `INNER JOIN` and `LEFT JOIN`?

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2024-09-10 last updatedFreePostgreSQL

`INNER JOIN` returns rows where there is a match in both joined tables, while `LEFT JOIN` (or `LEFT OUTER JOIN`) returns all rows from the left table and matched rows from the right table. If there’s no match, NULL values are returned for the right table's columns. For example: `SELECT * FROM a INNER JOIN b ON a.id = b.a_id;` versus `SELECT * FROM a LEFT JOIN b ON a.id = b.a_id;`.

`INNER JOIN` returns rows where there is a match in both joined tables, while `LEFT JOIN` (or `LEFT OUTER JOIN`) returns all rows from the left table and matched rows from the right table. If there’s no match, NULL values are returned for the right table's columns. For example: `SELECT * FROM a INNER JOIN b ON a.id = b.a_id;` versus `SELECT * FROM a LEFT JOIN b ON a.id = b.a_id;`.

`INNER JOIN` returns rows where there is a match in both joined tables, while `LEFT JOIN` (or `LEFT OUTER JOIN`) returns all rows from the left table and matched rows from the right table. If there’s no match, NULL values are returned for the right table's columns. For example: `SELECT * FROM a INNER JOIN b ON a.id = b.a_id;` versus `SELECT * FROM a LEFT JOIN b ON a.id = b.a_id;`.

`INNER JOIN` returns rows where there is a match in both joined tables, while `LEFT JOIN` (or `LEFT OUTER JOIN`) returns all rows from the left table and matched rows from the right table. If there’s no match, NULL values are returned for the right table's columns. For example: `SELECT * FROM a INNER JOIN b ON a.id = b.a_id;` versus `SELECT * FROM a LEFT JOIN b ON a.id = b.a_id;`.

How do you add TypeScript support to a Next.js project?

How do you add TypeScript support to a Next.js project?

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2024-09-19 last updatedFreeNextJs

You can add TypeScript to a Next.js project by simply adding a `tsconfig.json` file or running `npx create-next-app --typescript`. Next.js will automatically configure TypeScript for you. Example: Once integrated, you can start writing components and pages using TypeScript for better type safety and development experience.

You can add TypeScript to a Next.js project by simply adding a `tsconfig.json` file or running `npx create-next-app --typescript`. Next.js will automatically configure TypeScript for you. Example: Once integrated, you can start writing components and pages using TypeScript for better type safety and development experience.

You can add TypeScript to a Next.js project by simply adding a `tsconfig.json` file or running `npx create-next-app --typescript`. Next.js will automatically configure TypeScript for you. Example: Once integrated, you can start writing components and pages using TypeScript for better type safety and development experience.

You can add TypeScript to a Next.js project by simply adding a `tsconfig.json` file or running `npx create-next-app --typescript`. Next.js will automatically configure TypeScript for you. Example: Once integrated, you can start writing components and pages using TypeScript for better type safety and development experience.

What is the difference between DTD and XML Schema?

What is the difference between DTD and XML Schema?

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2024-09-19 last updatedFreeXML

DTD (Document Type Definition) and XML Schema are both used to define the structure of an XML document. However, XML Schema is more powerful as it supports data types, namespaces, and more complex structures. DTD is simpler but less expressive. XML Schema is written in XML itself, making it more extensible, while DTD has its own syntax. XML Schema also allows for richer validation rules compared to DTD. 

 DTD: <!ELEMENT note (to,from,heading,body)>
XML Schema: <xs:element name="note" type="xs:string" />

DTD (Document Type Definition) and XML Schema are both used to define the structure of an XML document. However, XML Schema is more powerful as it supports data types, namespaces, and more complex structures. DTD is simpler but less expressive. XML Schema is written in XML itself, making it more extensible, while DTD has its own syntax. XML Schema also allows for richer validation rules compared to DTD. 

 DTD: <!ELEMENT note (to,from,heading,body)>
XML Schema: <xs:element name="note" type="xs:string" />

DTD (Document Type Definition) and XML Schema are both used to define the structure of an XML document. However, XML Schema is more powerful as it supports data types, namespaces, and more complex structures. DTD is simpler but less expressive. XML Schema is written in XML itself, making it more extensible, while DTD has its own syntax. XML Schema also allows for richer validation rules compared to DTD. 

 DTD: <!ELEMENT note (to,from,heading,body)>
XML Schema: <xs:element name="note" type="xs:string" />

DTD (Document Type Definition) and XML Schema are both used to define the structure of an XML document. However, XML Schema is more powerful as it supports data types, namespaces, and more complex structures. DTD is simpler but less expressive. XML Schema is written in XML itself, making it more extensible, while DTD has its own syntax. XML Schema also allows for richer validation rules compared to DTD. 

 DTD: <!ELEMENT note (to,from,heading,body)>
XML Schema: <xs:element name="note" type="xs:string" />

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