initial
Returns a new array containing all elements except the last one from the input array.
For an empty array or an array with a length of 1, it returns an empty array ([]).
Signature
typescript
function initial<T>(arr: T[]): T[];Parameters
arr(T[]): The array from which to return all elements except the last one.
Returns
(T[]): A new array containing all elements except the last one from the input array. For an empty array or an array with a length of 1, it returns an empty array ([]).
Examples
typescript
const arr1 = [1, 2, 3];
const result = initial(arr1);
// result is [1, 2].
const arr2: number[] = [];
const result = initial(arr2);
// result is [].
const arr3: number[] = [1];
const result = initial(arr3);
// result is [].
const largeArray = Array(1000)
.fill(0)
.map((_, i) => i);
const result = initial(largeArray);
// result is [0, 1, 2 ..., 998].
const nestedArray = [
[3, 1],
[3, 2],
[3, 3],
];
const result = initial(nestedArray);
// result is [[3, 1], [3, 2]].
Hung Hoang