Thread by @swapnakpanda

JavaScript Interview Preparation Simplified

⇩

➊ Common Expectations

➊.➀ Behavioural Skills

➀ Good Etiquette
➁ Ability to work in a Team
➂ Ability to provide solutions
➃ Proactivity in detecting issues
➄ Ability to work in diverse situations
➅ Time management
➆ Handling criticism
➇ Handling escalations

➊.➁ Technical Skills

➀ Language Syntax
➁ Key features in JavaScript
➂ Frameworks/Libraries
➃ Portfolio/Real Projects

➋ Language Syntax

➀ Variable Naming & Declaration
➁ Data Types
➂ Expression, Statement & Block
➃ Operators
➄ Conditional Statements
➅ Looping Statements
➆ Functions
➇ Strings
➈ Arrays
➉ Object Literals
➀➀ Asynchronous
➀➁ OOP

➌ Important Features

➌.➀ Variable Naming & Declaration

➀ var, let, const
➁ Naming Rule
➂ Default value

➌.➁ Data Types, Special Values

➀ Several Types
➁ Type Coercion
➂ typeof, instanceof
➃ undefined, null
➄ NaN, Infinity
➅ How JS stores numbers?

➌.➂ Expression, Statement & Block

➀ Variable Scope
➁ Variable Hoisting
➂ Keywords

➌.➃ Operators

➀ Arithmetic
➁ Comparison
➂ Short Circuit (&& and ||)
➃ Nullish Coalescing (??)
➄ Optional Chaining (?.)
➅ Ternary (?:)
➆ Operator Precedence

➌.➄ Conditional Statements

➀ if
➁ if...else
➂ if...else if...
➃ switch case

➌.➅ Looping Statements

➀ while
➁ do...while
➂ for

➌.➆ Functions

➀ Declaration & Invocation
➁ Function Parameter vs Arguments
➂ Default Function Parameters
➃ Using "arguments"
➄ Arrow Function
➅ Callback Function
➆ Higher Order Function
➇ Variadic Function
➈ IIFE
➉ Closure

➌.➇ Strings

➀ How String operates
➁ Creating a String
➂ Getting a character and its code
➃ Getting a substring
➄ String concatenation
➅ String Template Literal (``)
➆ String's utility methods
➇ Using RegEx

➌.➈ Arrays

➀ Creating an Array
➁ array.length
➂ Finding elements/index of element
➃ Looping through array (HOFs, for...of loop)
➄ Inserting/Deleting Element(s)
➅ slice vs splice
➆ Spread vs Rest Param
➇ Destructuring Assignment

➌.➉ Object Literals

➀ Creating Object through literals
➁ JSON vs Object Literals
➂ Getting Keys, Values
➃ Looping through Object entries (for...in)
➄ Spread vs Rest Param
➅ Destructuring Assignment

➌.➀➀ Asynchronous

➀ setTimeout, setInterval, requestAnimationFrame
➁ Callback Functions
➂ Promise API
➃ asynch await

➌.➀➁ OOP

➀ new operator
➁ Constructor function and Object creation
➂ getter and setter
➃ Class
➄ use of this
➅ prototype object
➆ Object Inheritance in JS
➇ Utility methods of Object class

➌.➀➂ Browser APIs

⮑ DOM API
⮑ Fetch API
⮑ Graphics
⮑ Canvas API
⮑ WebGL
⮑ Rich Media
⮑ Web Audio API
⮑ Media Streams API
⮑ Device
⮑ Notifications API
⮑ Vibration API
⮑ Client-side Storage
⮑ Web Storage API
⮑ IndexedDB API

➌.➀➃ Others

➀ Set class
➁ Map class
➂ Date class
➃ Utility Math functions
➄ Iterator
➅ Generator

End of 🧵

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