Some Concepts of backend

Sumaiya Tasnim — Sat, 19 Feb 2022 21:04:27 +0000

Q. CRUD Operations.
CRUD Meaning: CRUD is an acronym that comes from the world of computer programming and refers to the four functions that are considered necessary to implement a persistent storage application: create, read, update and delete.

Q. JWT .
WT, or JSON Web Token, is an open standard used to share security information between two parties — a client and a server. Each JWT contains encoded JSON objects, including a set of claims. JWTs are signed using a cryptographic algorithm to ensure that the claims cannot be altered after the token is issued.

Q .What is a mongoose used for?

Mongoose is an Object Data Modeling (ODM) library for MongoDB and Node. js. It manages relationships between data, provides schema validation, and is used to translate between objects in code and the representation of those objects in MongoDB.

Q. Is MySQL is a relational database?
MySQL databases are relational.
The logical model, with objects such as databases, tables, views, rows, and columns, offers a flexible programming environment. ... SQL is the most common standardized language used to access databases.

Q.What is aggregation and example?
Aggregation is the process of combining things. That is, putting those things together so that we can refer to them collectively. As an example, think about the phone numbers on your cell phone. You can refer to them individually - your mother's number, your best friend's number, etc.

Q. Express
Express. js is a free and open-source web application framework for Node. js. It is used for designing and building web applications quickly and easily.

Some CSS Questions

Sumaiya Tasnim — Sat, 19 Feb 2022 16:25:19 +0000

1.How will you make font size responsive?
-If we specify text size with vw unit, it will be changed with respect to the screen size.
-We can also change font size with media queries.
-also declaring the value with rem can also make fonts responsive if the root value of the browser changes.
11.What are CSS Sprites?
-The mechanism of combining multiple images into one larger image is called CSS sprites. Gmail uses such technique. A sprite generator pack can be used to achieve the objective.

What are Vendor-Prefixes? -Browser vendors add some experimental CSS and JavaScript APIs. It is done to inspire developers to try out new ideas. But in reality we see that sometimes these prefixes breaks code. Some common prefixes are -webkit-(chrome), -moz-(firefox), -o-(opera), -ms-(IE, ME)

3.What is tweening?
-Sometimes there is a frame that is produced between two images, this mechanism is called tweening. It is an illusion that makes an impression that the first image is naturally transitioned into the second image. Almost all forms of animation use this technology. This effect can be produced with CSS3 with Transform values such as matrix, convert, rotate and scale.

4.How is inheritance implemented in CSS?
-When a child class get holds off, the assets that the parent element posses is called inheritance. It easily defines the hierarchy in CSS from top to bottom. Usually, if the class-name in parent and child are the same, then child class will override the property.

5.What does the embedded stylesheet mean?
-A reserved space which specify the style sets for the HTML text in a singular location. It is put into effect when the styles are embedded inside HTML tags.

6.What is a declaration block?
-Declaration block in CSS is the space where one or more declaration takes place separated by semicolon. Each declaration contains a CSS property name and value assigned to it and then separated by a semicolon. Declaration blocks look like this

h1{color:white;}
p{text-align:center}

7.What is RWD?
-RWD stands for Responsive web design. This idea is implemented to make a webpage fit to any kind of screen available and make the page readable.

8.What is the difference between visibility: hidden and display: none?
-visibility hidden means the element is there but can not be seen. But it will consume no space.
-Display none means the element is hidden, but it will take up some space, hence the layout will be affected.

9.What is the ruleset?
-The phenomenon where two selectors are combined is called a ruleset.
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0.How case-sensitive is CSS?
-CSS is not usually case-sensitive, except for the URLs and font families. But when XML is used, the declaration with XHTML DOCTYPE CSS is case-sensitive.

DEV Community: Sumaiya Tasnim

Some Concepts of backend

Some CSS Questions