microsoft/qdk

/// # Sample
/// Array
///
/// # Description
/// An array literal is a sequence of one or more expressions, separated by commas
/// and enclosed in brackets `[` and `]`; for example, `[1,2,3]`. All expressions must
/// have a common base type, which is the item type of the array.
///
/// Arrays of arbitrary length, and in particular empty arrays, may be created using
/// a new array expression. Such an expression is of the form new `[expr1, size = expr2]`,
/// where `expr1` is an expression of any type and `expr2` is an expression of type `Int`.
/// The expression `expr1` is used as the default value for all of the array items.
///
/// For example, `[0, size = 10]` creates an array of zeroes containing ten items.
/// The length of an array can be queried with the function `Length`. It is defined
/// in the automatically opened namespace `Microsoft.Quantum.Core` and returns an `Int` value.
/// Suitable initialization routines for arrays of `Qubit`s can be found in the
/// `Microsoft.Quantum.Arrays` namespace.
namespace MyQuantumApp {

    @EntryPoint()
    operation Main() : Int[] {

        // A basic Int Array literal
        let intArray : Int[] = [1, 2, 3, 4];
        // A basic String Array literal
        let stringArray = ["a", "string", "array"];

        // A new array expression creating the array `[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]`
        let intArray = Repeated(0, 10);

        // Arrays can be sliced with ranges.
        let slice = intArray[1..2..4];  // contains [2,4]
        let slice = intArray[2..-1..0]; // contains [3,2,1]
        let slice = intArray[...]; // contains [1, 2, 3, 4];

        return intArray;
    }
}