Definition

object split(array[any] $array, int $count)

Splits $array into two, where the first resulting array contains $count elements, and the second one the remaining elements. The two arrays are returned inside an object with properties first and last.

Parameters

array $array

Array to split.

int $count

The count of elements to put into the first array. If $count is greater than the length of array, last will be an empty array. $count can be a non-positive integer as well, in which case the split is done in the same way as if it was positive, but the arrays first and last are switched.

Returns

An object with two properties, first and last, where the value of the first is an array consisting of the first $count elements of $array, and the value of last is an array consisting of any remaining elements of $array.

Examples

{
    a: split(`[1, 2, 3]`, `1`),
    b: split(`[1, 2, 3]`, `3`),
    c: split(`[1, 2, 3]`, `5`),
    d: split(`[1, 2, 3]`, `-1`),
    e: split(`[1, 2, 3]`, `2.0`),       // Error
    f: split(`[1, 2, 3]`, `true`),      // Error
    g: split(`[1, 2, 3]`, `null`)       // Error
}

{
  "a": {
    "first": [1],
    "last": [2, 3]
  },
  "b": {
    "first": [1, 2, 3],
    "last": []
  },
  "c": {
    "first": [1, 2, 3],
    "last": []
  },
  "d": {
    "first": [2, 3],
    "last": [1]
  }
}

Remarks

Equivalent to {"first": array[:count], "last": array[count:]} for non-negative indices and {"first": array[-count:], "last": array[:-count]} for negative indices.