https://github.com/sumanbiswas7/javascript-interview

javascript interview questions, answers and resources written in typescript :)
https://github.com/sumanbiswas7/javascript-interview

interview javascipt

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javascript interview questions, answers and resources written in typescript :)

• Host: GitHub
• URL: https://github.com/sumanbiswas7/javascript-interview
• Owner: sumanbiswas7
• Created: 2022-08-05T16:16:39.000Z (over 2 years ago)
• Default Branch: main
• Last Pushed: 2022-08-08T03:50:09.000Z (over 2 years ago)
• Last Synced: 2024-05-29T22:20:36.768Z (7 months ago)
• Topics: interview, javascipt
• Language: TypeScript
• Homepage:
• Size: 9.77 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: Readme.md

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README

        
# Javascript Interview

basic to intermediate level questions and answers, resources to prepare for javascript interview

## Table of contents

| No  | Core concepts                                                             |

| --- | ------------------------------------------------------------------------- |

| 1   | [Check if the user exists in the given object](#Check-if-the-user-exists) |

| 2   | [Explain "this" keyword in javascript](#this-keyword-in-javascript)       |

| 3   | [Regular expressions](#regular-expression-in-javascript)                  |

## Answers

### Check if the user exists

```javascript

const users = [

  { name: "paul", age: 22 },

  { name: "jerry", age: 18 },

  { name: "rita", age: 25 },

  { name: "max", age: 21 },

  { name: "harry", age: 21 },

];

```

to find if a given user exists in the users array we could use filter, loops, etc. but we only need true if the user exists or false if not. array.some() function can be the best option for dealing with this senario.

```javascript

users.some((user) => user.name === "paul"); //true

users.some((user) => user.name === "cillian"); //false

```


**[⬆ Back to Top](#table-of-contents)**

### This keyword in javascript

in javascript this keyword represents the execution context, basically, the object that's calling the func, there are so many caveats to keep in mind please go through these articles below to get a good understanding of this.

1. [Beginner explaination of this](https://www.youtube.com/watch?v=gvicrj31JOM)

2. [Intermediate explanation of this](https://dmitripavlutin.com/gentle-explanation-of-this-in-javascript/)


**[⬆ Back to Top](#table-of-contents)**

### Regular expression in javascript

Regular expressions are patterns used to match character combinations in strings. In JavaScript, regular expressions are also objects. go through these resources below to get a good idea of Regex.

1. [Youtube video of Regex](https://www.youtube.com/watch?v=rhzKDrUiJVk&t=573s)

2. [Documentation Regex](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions)


**[⬆ Back to Top](#table-of-contents)**