Creating an Array: Difference between revisions

Converting from a list:

let array = Array.of_list some_list

=={{header|Standard ML}}==

Converting from a list:

val array = Array.fromList [1,2,3,4,5]

To create an array of five elements with the value 0:

val num_items = 5 and initial_value = 0;

val array = Array.array (num_items, initial_value)

To create an array with contents defined by passing each index to a callback (in this example, the array is set to the squares of the numbers 0 through 4):

fun callback index = index * index;

val array = Array.tabulate (5, callback)

In addition to arrays, the Standard ML library also has "vectors", which are immutable arrays. Most implementations support the following syntax for a vector literal, although it is not standard:

val vector = #[1,2,3,4,5]