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]
Hung Hoang