The table summarizes the array functions available in APL.
| Function | Description |
|---|---|
| array_concat | Concatenates a number of dynamic arrays to a single array. |
| array_extract | Returns a dynamic array containing the extracted elements. |
| array_iff | Returns a new array containing elements from the input array that satisfy the condition. |
| array_index_of | Searches the array for the specified item, and returns its position. |
| array_length | Calculates the number of elements in a dynamic array. |
| array_reverse | Reverses the order of the elements in a dynamic array. |
| array_rotate_left | Rotates values inside a dynamic array to the left. |
| array_rotate_right | Rotates values inside a dynamic array to the right. |
| array_select_dict | Selects a dictionary from an array of dictionaries. |
| array_shift_left | Shifts the values inside a dynamic array to the left. |
| array_shift_right | Shifts values inside an array to the right. |
| array_slice | Extracts a slice of a dynamic array. |
| array_sort_asc | Sorts an array in ascending order. |
| array_sort_desc | Sorts an array in descending order. |
| array_split | Splits an array to multiple arrays according to the split indices and packs the generated array in a dynamic array. |
| array_sum | Calculates the sum of elements in a dynamic array. |
| bag_has_key | Checks whether a dynamic property bag contains a specific key. |
| bag_keys | Returns all keys in a dynamic property bag. |
| bag_pack | Converts a list of key-value pairs to a dynamic property bag. |
| isarray | Checks whether a value is an array. |
| len | Returns the length of a string or the number of elements in an array. |
| pack_array | Packs all input values into a dynamic array. |
| pack_dictionary | Returns a dynamic object that represents a dictionary where each key maps to its associated value. |
| strcat_array | Takes an array and returns a single concatenated string with the array’s elements separated by the specified delimiter. |
Dynamic arrays
Most array functions accept a dynamic array as their parameter. Dynamic arrays allow you to add or remove elements. You can change a dynamic array with an array function.
A dynamic array expands as you add more elements. This means that you don’t need to determine the size in advance.