Array

: Most languages start counting at 0. To access the first item, you use index 0 , the second use 1 , and so on. Fixed vs. Dynamic Size :

: Creates a new array containing only the items that meet a specific condition.

: Transforms every item in an array and returns a new one. : Most languages start counting at 0

An array is a fundamental data structure used in programming to store an ordered collection of items of the same type in a single variable. Think of it like a row of buckets where each bucket holds one specific piece of data, such as a number or a string.

: Fetching a value by its index is extremely fast ( time complexity). Dynamic Size : : Creates a new array

For a deeper dive into technical implementation, you can explore the Array cheatsheet on the for coding prep or the Complete Guide to JavaScript Arrays on the ServiceNow Community forum. Everything you needed to know and more about Array.map

: Removing or adding elements at the beginning is slower because the computer must shift every other item to a new position. Think of it like a row of buckets

: Arrays allocate a solid block of memory where each element is placed right next to the previous one. This allows the computer to calculate the location of any item instantly.