Map Access Guide

Map Access

Feature Overview

This feature adds array access support to maps.

Prerequisite

None

Sweet Apex Example

public class MapAccess {
    public static void main() {
        Map count = new Map{ 'a' => 2 };
        Integer i = count['a'];
        ++count['a'];
        count['a']++;
        count['a'] += 2;

        List nums = new List{ 2 };
        Integer j = nums[0];
        ++nums[0];
        nums[0]++;
        nums[0] += 2;
    }
}

Transpiled Apex

public class MapAccess {
    public static void main() {
        Map count = new Map{ 'a' => 2 };
        Integer i = count.get('a');
        count.put('a', count.get('a') + 1);
        count.put('a', count.get('a') + 1);
        count.put('a', count.get('a') + 2);
        List < Integer > nums = new List{ 2 };
        Integer j = nums[0];
        ++nums[0];
        nums[0]++;
        nums[0] += 2;
    }
}

Usage

Array access for maps support assignment expressions, postfix expressions, and prefix expressions.

Postfix and prefix expressions of map access cannot be used in assignments.

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