Working with Arrays JavaScript Part 1
In this JavaScript tutorial, we cover everything you need to know about arrays in JavaScript, including how to declare, define, access, and modify elements, as well as how to find the length of an array. You’ll learn:
The most common way to declare and define arrays in JavaScript
How arrays store data in indexed positions starting from zero
How arrays can hold different data types (strings, numbers, booleans, objects)
The constructor method of creating arrays using new Array()
How to access elements by index (zero-based indexing)
How to modify existing elements in an array
How the .length property works to find the size of an array
How to store the array length in a variable using camelCase naming
Best practices when working with arrays in JavaScript
We’ll walk through real code examples including an insectArray, a nums array, and a books array, showing how to log arrays to the console, access single values, and update them. This is perfect for JavaScript beginners and those reviewing core data structure concepts.
Timestamps:
0:00 Declaring and defining an array
0:34 Indexed positions explained (starting at 0)
0:58 Arrays with different data types
1:36 Using the new Array() constructor method
2:18 Accessing elements with index notation
3:30 Modifying elements inside an array
4:12 Using the .length property
5:02 Storing array length in a variable (camelCase vs PascalCase)
6:06 Summary and what’s next for arrays
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