Array functions

This section explains how to use array functions in APL.

The table summarizes the array functions available in APL.

Function	Description
array_concat	Concatenates a number of dynamic arrays to a single array.
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_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.
isarray	Checks whether a value is an array.
pack_array	Packs all input values into a dynamic array.
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.