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JavaScript

Information Technology > Programming languages

Description

JavaScript is a versatile programming language primarily used for enhancing web pages to provide a more interactive user experience. It allows developers to create dynamic content, handle user input, manage data, and even build full-fledged web applications. JavaScript skills range from understanding basic syntax, variables, and control structures, to more advanced topics like asynchronous programming, design patterns, and server-side development with Node.js. Mastery of JavaScript involves deep knowledge of its internals, performance optimization, state management libraries, and build tools. With its wide use in both front-end and back-end development, proficiency in JavaScript is a highly valued skill in the tech industry.

Stack

JAM

Expected Behaviors

✎
LEVEL 1

Fundamental Awareness

At this level, individuals have a basic understanding of what JavaScript is and its syntax. They are familiar with variables, data types, basic operators, control structures like if, else, switch, and basic functions. However, they may not be able to write complex programs yet.

🌱
LEVEL 2

Novice

Novices can write simple JavaScript programs. They understand arrays, objects, loops like for and while, and can perform basic DOM manipulation. They also have an understanding of event handling and basic error handling and debugging techniques.

🌍
LEVEL 3

Intermediate

Intermediate users are proficient in using advanced JavaScript features like closures, prototypes, JSON, AJAX, and asynchronous programming. They have experience with ES6 features and regular expressions. They also understand object-oriented programming in JavaScript.

⭐
LEVEL 4

Advanced

Advanced users are proficient in using advanced ES6+ features and understand JavaScript design patterns. They can write unit tests for their code and understand functional programming concepts. They have experience with modern front-end frameworks/libraries and server-side JavaScript with Node.js.

🏆
LEVEL 5

Expert

Experts have a deep understanding of JavaScript internals and the event loop. They are proficient in performance optimization, memory management, and can build full-stack JavaScript applications. They have experience with complex state management libraries, advanced testing techniques, and tools, as well as JavaScript build tools and transpilers.

Micro Skills

✎
LEVEL 1

Fundamental Awareness

Awareness of JavaScript as a programming language
Knowledge of the role of JavaScript in web development
Understanding of the difference between JavaScript and other programming languages
Familiarity with JavaScript keywords
Understanding of JavaScript statements
Knowledge of JavaScript comments
Ability to write simple JavaScript expressions
Understanding of how to declare variables
Knowledge of different data types in JavaScript
Ability to assign values to variables
Understanding of variable scope
Knowledge of arithmetic operators
Understanding of assignment operators
Familiarity with comparison operators
Knowledge of logical operators
Understanding of conditional statements
Ability to use if, else if, else statements
Knowledge of switch case statement
Understanding of how to define a function
Knowledge of function parameters and arguments
Ability to call a function
Understanding of return statement
🌱
LEVEL 2

Novice

Understanding of how to structure a program
Knowledge of how to use console.log for output
Ability to use basic arithmetic and string operations
Understanding of how to use comments
Ability to declare and initialize arrays and objects
Understanding of how to access array elements and object properties
Knowledge of basic array methods like push, pop, shift, unshift
Understanding of how to iterate over arrays and objects
Understanding of how to use for loop
Knowledge of how to use while and do-while loops
Ability to control loop execution with break and continue
Understanding of nested loops
Understanding of how to select HTML elements
Ability to change element content and attributes
Knowledge of how to create and remove elements
Understanding of how to handle form inputs
Ability to attach event listeners to elements
Understanding of event propagation (bubbling and capturing)
Knowledge of different types of events (click, load, mouse events, keyboard events)
Ability to prevent default event behavior
Understanding of how to use console.log for debugging
Ability to use try-catch blocks for error handling
Knowledge of how to use the browser's developer tools
Understanding of common JavaScript errors
🌍
LEVEL 3

Intermediate

Understanding of variable scoping in JavaScript
Understanding of execution context and the call stack
Creating closures
Using closures
Understanding of prototypes in JavaScript
Implementing prototype-based inheritance
Adding methods to prototypes
Adding properties to prototypes
Understanding of JSON syntax
Working with JSON data
Parsing JSON
Stringifying JSON
⭐
LEVEL 4

Advanced

Ability to destructure objects
Ability to destructure arrays
Using spread operator
Using rest operator
Writing async functions
Using await keyword
Using try/catch blocks
Handling rejected promises
🏆
LEVEL 5

Expert

Understanding of global and function execution contexts
Understanding of block scope and function scope
Understanding of closure
Experience with Chrome DevTools
Understanding of JavaScript performance metrics
Understanding of unidirectional data flow
Experience with Redux or Vuex
Understanding of Node.js architecture
Experience with Express.js
Experience with Jest or Mocha
Understanding of mocking and stubbing
Understanding of entry, output, loaders, plugins in Webpack
Experience with Babel

Skill Overview

  • Expert3 years experience
  • Micro-skills79
  • Roles requiring skill26

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