TypeScript Array of Objects: Declare, Find, Sort and Group
Declare a typed array of objects with an interface or type alias, then add, find, filter, sort, group and update its objects without surprises.
TypeScript Array of Vectors: Tuples, Math and Typed Arrays
TypeScript has no Vector class. Model each vector as a tuple such as [x: number, y: number, z: number], store them in an array, and do vector math with typed functions.
TypeScript map vs flatMap: Array Differences and Examples
The map() method returns one result per element, while flatMap() can return zero, one or many and flattens them one level. Tested examples on TypeScript 7.0.2.
TypeScript Array slice(): Negative Indexes and Examples
How slice(start, end) copies part of a TypeScript array: excluded end index, negative indexes, pagination and chunks, shallow copies, slice() vs splice(), and result types.
TypeScript Remove Item from Array: splice, filter, pop
Remove items from a TypeScript array by position or by value, in place or on a copy, with the common bugs (-1 index, splice in a loop, delete) shown and fixed.
TypeScript Add Element to Array: push, unshift, splice
Add items to the end, start or any index of a TypeScript array, or to a new array with spread, concat() and toSpliced(), with the compiler errors explained.
TypeScript Find Element in Array: find, findIndex, findLast
Find elements in a TypeScript array with find(), findIndex(), findLast() and findLastIndex(), handle the T | undefined result, and pick the right search method.
TypeScript Filter Array of Objects by Property (filter())
Filter an array of objects by property in TypeScript with filter(): single and multiple conditions, lists of values, nested and optional fields, a typed filterBy() helper and type narrowing.
TypeScript Array: Types, readonly, Tuples and ES2023 Methods
How to declare, type, read, loop over, copy and protect arrays in TypeScript, with tuples and the ES2023 copying methods, tested on TypeScript 7.0 and Node.js 22.