Destructure Guide

Destructure

Feature Overview

This feature enables destructuring from list/map/sobject.

Prerequisite

None

Sweet Apex Example

public class DestructureDemo {
    public static void main() {
        List names = new List{ 'Wilson', 'Adam' };
        String { p1, p2 } = names;

        Map infos = new Map{ 'a' => 1, 'b' => '2' };
        { a: Integer count, b: String id } = infos;

        Account ac = new Account(Name='test acc');
        { Name: String name } = ac;

        List numbers = new List{ 1, 2, 3, 4, 5 };
        Integer { first, _ } = numbers;
        Integer { _, last } = numbers;

        List signs = new List{};
        String { sign : String = 'stop' } = signs;
    }
}

Transpiled Apex

public class DestructureDemo {
    public static void main() {
        List names = new List{ 'Wilson', 'Adam' };
        List destructure_1 = (List)names;
        String p1 = (String)destructure_1.get(0);
        String p2 = (String)destructure_1.get(1);

        Map infos = new Map{ 'a' => 1, 'b' => '2' };
        Map destructure_6 = (Map)infos;
        Integer count = (Integer)destructure_6.get('a');
        String id = (String)destructure_6.get('b');

        Account ac = new Account(Name = 'test acc');
        SObject destructure_11 = (SObject)ac;
        String name = (String)destructure_11.get('Name');

        List numbers = new List{ 1, 2, 3, 4, 5 };
        List destructure_15 = (List)numbers;
        Integer first = (Integer)destructure_15.get(0);
        List destructure_17 = (List)numbers;
        Integer last = (Integer)destructure_17.get(destructure_17.size() - 1);

        List signs = new List{  };
        List destructure_21 = (List)signs;
        String sign = (String)Sweet.defaultIfNull(destructure_21.get(0), 'stop');
    }
}
Usage
Destructuring is built on the base of type inference. Should the type inference go wrong, the generated destructuring code might fail.
You can insert one _ as a placeholder when destructuring a list.
Also you can append default values during destructuring.
Contribute on Github! Edit this section.