JavaScript Tutorial for Beginners: Learn JavaScript in 1 Hour
Programming with Mosh・2 minutes read
JavaScript is a popular programming language with a $72,000 average salary in the US, providing job opportunities in various roles. It can be used to create web pages, apps, and games, with objects, arrays, functions, and dynamic properties in the code.
Insights
- JavaScript is a versatile programming language used by major companies like Netflix and Walmart, offering various job opportunities as a front-end developer, back-end developer, or full stack developer.
- Understanding JavaScript involves mastering key concepts like variable declaration with `let`, dynamic typing, object manipulation, and the use of arrays and functions to create interactive web applications and games.
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Recent questions
What are some popular companies using JavaScript?
Netflix, Walmart, PayPal
How much is the average salary for a JavaScript developer in the US?
$72,000 per year
What are the different roles JavaScript developers can have?
Front-end, back-end, full stack developer
What are some tools JavaScript developers use?
Visual Studio Code, Node
What is ECMAScript and its relation to JavaScript?
Specification, JavaScript conforms to it
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Summary
00:00
JavaScript: Versatile Language for Web Development
- JavaScript is a widely used programming language, growing rapidly and utilized by major companies like Netflix, Walmart, and PayPal.
- Average salary for a JavaScript developer in the United States is $72,000 per year, offering good job opportunities.
- JavaScript allows for roles like front-end developer, back-end developer, or full stack developer.
- JavaScript can be used to build interactive web pages, full-blown web or mobile apps, real-time networking applications, command-line tools, and games.
- JavaScript code can run in browsers through JavaScript engines like SpiderMonkey and V8, or in Node using Google's V8 JavaScript engine.
- ECMAScript is a specification, with JavaScript being a programming language conforming to this specification.
- ECMAScript 2015 (ES6) introduced new features for JavaScript.
- Visual Studio Code is a recommended code editor for writing JavaScript code.
- Node is a useful tool for installing third-party libraries and running JavaScript code outside of browsers.
- Separation of concerns is important in programming, separating HTML content from JavaScript behavior.
17:05
JavaScript Variable Declaration and Usage Essentials
- Variable declaration in JavaScript involves using the `let` keyword instead of `var` post ES6.
- Variables in JavaScript need meaningful names and cannot be reserved keywords.
- Variable names cannot start with a number, contain spaces or hyphens, and are case-sensitive.
- Multiple variables can be declared on one line separated by commas or on separate lines.
- Constants in JavaScript are declared using the `const` keyword to prevent reassignment.
- Primitives in JavaScript include strings, numbers, booleans, undefined, and null.
- JavaScript is a dynamic language where variable types can change at runtime.
- The `typeof` operator in JavaScript determines the type of a variable.
- Objects in JavaScript are used to group related variables together, simplifying code.
- Object properties can be accessed and modified using dot notation or bracket notation.
34:46
Dynamic JavaScript Arrays and Functions
- In JavaScript, a variable like "selection" can determine the name of the target property the user selects, which can change at runtime.
- Accessing properties dynamically using bracket notation allows for dynamic changes in properties based on user selection.
- Arrays are used to store lists of objects, like products in a shopping cart or colors selected by a user.
- Declaring an array involves using square brackets to indicate an empty array and initializing it with elements like "red" and "blue."
- Elements in an array have indexes starting from zero, with the ability to access elements using these indexes.
- JavaScript allows for dynamic changes in array length and the types of objects stored within it.
- Arrays in JavaScript are objects with properties like "length," which returns the number of elements in the array.
- Functions in JavaScript are sets of statements that perform tasks or calculate values, with parameters and arguments defining inputs and outputs.
