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Beginner's Guide to JavaScript Fundamentals

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Introduction

In this lab, we will dive into the world of JavaScript programming and explore various concepts, including variables, data types, conditional statements, loops, and functions. Through hands-on exercises and projects, you will learn how to write clean and efficient code, debug errors, and create interactive web applications using JavaScript. This lab is designed for beginners who want to develop a strong foundation in JavaScript programming.

Skills Graph

%%%%{init: {'theme':'neutral'}}%%%% flowchart RL javascript(("`JavaScript`")) -.-> javascript/BasicConceptsGroup(["`Basic Concepts`"]) javascript(("`JavaScript`")) -.-> javascript/AdvancedConceptsGroup(["`Advanced Concepts`"]) javascript(("`JavaScript`")) -.-> javascript/ToolsandEnvironmentGroup(["`Tools and Environment`"]) javascript/BasicConceptsGroup -.-> javascript/variables("`Variables`") javascript/BasicConceptsGroup -.-> javascript/data_types("`Data Types`") javascript/BasicConceptsGroup -.-> javascript/arith_ops("`Arithmetic Operators`") javascript/BasicConceptsGroup -.-> javascript/comp_ops("`Comparison Operators`") javascript/AdvancedConceptsGroup -.-> javascript/spread_rest("`Spread and Rest Operators`") javascript/ToolsandEnvironmentGroup -.-> javascript/debugging("`Debugging`") subgraph Lab Skills javascript/variables -.-> lab-28161{{"`Beginner's Guide to JavaScript Fundamentals`"}} javascript/data_types -.-> lab-28161{{"`Beginner's Guide to JavaScript Fundamentals`"}} javascript/arith_ops -.-> lab-28161{{"`Beginner's Guide to JavaScript Fundamentals`"}} javascript/comp_ops -.-> lab-28161{{"`Beginner's Guide to JavaScript Fundamentals`"}} javascript/spread_rest -.-> lab-28161{{"`Beginner's Guide to JavaScript Fundamentals`"}} javascript/debugging -.-> lab-28161{{"`Beginner's Guide to JavaScript Fundamentals`"}} end

How to Find the Union of Two Arrays in JavaScript

To find the union of two arrays in JavaScript, follow these steps:

  1. Open the Terminal/SSH and type node to start practicing coding.

  2. The union of two arrays returns every element that exists in any of the two arrays at least once.

  3. To get the union of two arrays, create a Set with all values of a and b, and convert it to an array using the Array.from() method.

Here's an example of how to implement this:

const union = (a, b) => Array.from(new Set([...a, ...b]));

console.log(union([1, 2, 3], [4, 3, 2])); // Output: [1, 2, 3, 4]

In the example above, the union() function takes two arrays, [1, 2, 3] and [4, 3, 2], as arguments and returns the union of the two arrays as an array [1, 2, 3, 4].

Summary

Congratulations! You have completed the Array Union lab. You can practice more labs in LabEx to improve your skills.

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