Thread by @swapnakpanda

💡 JavaScript Interview Preparation Simplified

If you are a beginner or, a new learner and going to appear (or already appearing) for an interview, this 🧵 is for you.

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I am getting many DM requests from students about preparing for JS interviews. So I thought of coming up with a series which may help who needs it.

This is going to be a series of threads and, this one is the very first in this series.

What is expected from you in an Interview?

1️⃣ Good behaviour
2️⃣ Knowledge of Syntax
3️⃣ Knowledge of Key Features and where to apply
4️⃣ Integration with other technologies in the stack
5️⃣ Usage of a framework
6️⃣ Analytical Ability

In this thread, we will cover 2️⃣ & 3️⃣

✪ Syntax

1️⃣ Variable Naming & Declaration
2️⃣ Data Types
3️⃣ Expression, Statement & Block
4️⃣ Operators
5️⃣ Conditional Statements
6️⃣ Looping Statements
7️⃣ Functions
8️⃣ Strings
9️⃣ Arrays
1️⃣0️⃣ Object Literals
1️⃣1️⃣ Asynchronous
1️⃣2️⃣ OOP

✪ Language Feature

1️⃣ Variable Naming & Declaration

✪ Usage of var, let, const
✪ Naming Rule
✪ Default value

2️⃣ Data Types

✪ Several Types in JS
✪ Type Coercion
✪ typeof, instanceof
✪ undefined, null
✪ NaN, Infinity
✪ How JS stores numbers?

3️⃣ Expression, Statement & Block

✪ Variable Scope
✪ Variable Hoisting
✪ Keywords

4️⃣ Operators

✪ Arithmetic, Comparison Operators
✪ Short Circuit (&& and ||)
✪ Nullish Coalescing (??)
✪ Optional Chaining (?.)
✪ Ternary (?:)
✪ Operator Precedence

5️⃣ Conditional Statements

✪ if
✪ if...else
✪ if...else if...
✪ switch case

6️⃣ Looping Statements

✪ while
✪ do...while
✪ for

7️⃣ Functions

✪ Declaration & Invocation
✪ Function Parameter vs Arguments
✪ Default Function Parameters
✪ Using "arguments" object inside function body
✪ Arrow Function
✪ Callback Function
✪ Higher Order Function
✪ Closure

8️⃣ Strings

✪ How String operates
✪ Creating a String
✪ Getting a character and its code
✪ Getting a substring
✪ String concatenation
✪ String Template Literal (``)
✪ String's utility methods
✪ Using RegEx

9️⃣ Arrays

✪ Creating an Array
✪ array.length
✪ Finding elements/index of element
✪ Looping through array (HOFs, for...of loop)
✪ Inserting/Deleting Element(s)
✪ slice vs splice
✪ Spread vs Rest
✪ Destructuring Assignment

1️⃣0️⃣ Object Literals

✪ Creating Object through literals
✪ JSON vs Object Literals
✪ Getting Keys, Values
✪ Looping through Object entries (for...in)
✪ Spread vs Rest
✪ Destructuring Assignment

1️⃣1️⃣ Asynchronous

✪ setTimeout, setInterval, requestAnimationFrame
✪ Callback Functions
✪ Promise API
✪ asynch await

1️⃣2️⃣ OOP

✪ new operator
✪ Constructor function and Object creation
✪ getter and setter
✪ Class
✪ use of this
✪ prototype object
✪ Object Inheritance in JS
✪ Utility methods of Object class

1️⃣2️⃣ Others

✪ Set class
✪ Map class
✪ Date class
✪ Utility Math functions
✪ Iterator
✪ Generator

That's it for this thread. I hope you found it useful.

Feel free to DM me in case you have any doubt regarding interview process, preparation etc. I ll be glad to help you there.

Till next thread in this series, have a good time. Happy hunting. 👋

Along with JS, some database knowledge is mandatory whether you are staying in FE or BE.

Check 👇 for knowledge on both SQL and NoSQL databases.

https://twitter.com/swapnakpanda/status/1453665370590515210?s=20