last ​
Returns the last element of an array.
This function takes an array and returns the last element of the array. If the array is empty, the function returns undefined.
Signature ​
typescript
function last<T>(arr: [...T[], T]): T;
function last<T>(arr: T[]): T | undefined;Parameters ​
arr(T[]): The array from which to get the last element.
Returns ​
(T | undefined): The last element of the array, or undefined if the array is empty.
Example ​
typescript
const arr1 = [1, 2, 3];
const result = last(arr1);
// result will be 3
const arr2: number[] = [];
const result = last(arr2);
// result will be undefined
const largeArray = Array(1000)
.fill(0)
.map((_, i) => i);
const result = last(largeArray);
// result will be 999
const nestedArray = [
[3, 1],
[3, 2],
[3, 3],
];
const result = last(nestedArray);
// result will be [3,3]