Sep 10, 2025 · An array is a collection of items of the same variable type that are stored at contiguous memory locations. It is one of the most popular and simple data structures used in programming.

With an array, you can: Store a collection of numbers, words, or objects. Access any value using its index (position). Read, update, insert, or remove any of the array values. See how an array can be …

Sep 28, 2025 · JavaScript arrays are zero-indexed: the first element of an array is at index 0, the second is at index 1, and so on — and the last element is at the value of the array's length property minus 1. …

Taking advantage of this feature, some languages (like FORTRAN 77) specify that array indices begin at 1, as in mathematical tradition while other languages (like Fortran 90, Pascal and Algol) let the user …

An array is a data structure that stores a fixed-size collection of elements such as integers or strings, sequentially in memory. Each element in the array is accessed using an index, starting from zero.

Jan 13, 2025 · What is an Array? An array is a collection of similar data elements stored at contiguous memory locations. It is the simplest data structure where each data element can be accessed directly …

For example, you can refer to the last element in the array with a[-1] or a[len(a)-1] and the first element with a[-len(a)] or a[0]. Python raises an IndexError at run time if you use an index outside of the …

Nov 20, 2025 · Some programming languages allow the use of negative indexes for the same purpose, like fruits[-1]. However, in JavaScript it won’t work. The result will be undefined, because the index in …

Practice Arrays Solve Arrays coding problems to start learning data structures and algorithms. This curated set of 23 standard Arrays questions will give you the confidence to solve interview questions.

Array declarations must contain the information about the size of the array. It is possible to leave the size out of the [ ] in the declaration as long as you initialize the array inline, in which case the array is …