Type definitions

import ballerina/io;

// Defines a type named `MapArray`.
type MapArray map<string>[];

public function main() {
    // Creates a `MapArray` value.
    // `arr` has elements which are of `map<string>` type.
    MapArray arr = [
        {"x": "foo"},
        {"y": "bar"}
    ];

    io:println(arr[0]);
}

Type definitions

A type definition gives a name for a type. Its name is just an alias for the type, like typedef in C.

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Covariance

import ballerina/io;

type MapArray map<string>[];

Defines a type named MapArray.

public function main() {

    MapArray arr = [
        {"x": "foo"},
        {"y": "bar"}
    ];

Creates a MapArray value. arr has elements which are of map<string> type.

    io:println(arr[0]);
}

bal run type_definitions.bal
{"x":"foo"}