[SalesForce] unable to fetch all Keys and Values in map

i am unable to fetch all Keys and Value simultaneously using forEach loop..

 for (Map<String,String> key : parameters) {

        queryParameters = key.values();//?
    }

Best Answer

If you want to fetch them all simultaneously, you have to do it outside the loop:

Map<String,String> aMap = new Map<String,String>();
Set<String> mapKeys = aMap.keySet();
List<String> mapValues = aMap.values();

Source: https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_methods_system_map.htm

If you absolutely need to all the keys inside a for loop (I don't know why... it sounds like bad practice to reference keys other than the one you're currently iterating), you can reference the mapKeys variable inside the for loop.

Or, just iterate and reference them one at a time as @MSCB described above

Related Solutions

[SalesForce] Apex Class as Map Keys and Sets

One case is this sfdcfox answer to a question about how to catch duplicate records. In that case equality is defined as a record that has the same first name, last name and email address. Rather than having to compare those three fields for every entry in an existing list, the code can just see if the set of existing keys contains the new key using one line of code (which is also fast because of the use of hashing).

Another case is code doing calculations on date range objects. A date range typically holds a start date and an end date and has methods to calculate things like the intersection between two date ranges. Sets and maps are typically used to hold collections of these. Because Apex now supports the equals and hashCode methods, it is simple to arrange that date range instances with the same start and end dates are interchangeable as map keys or set values.

[SalesForce] Declaring a map with String as keys and Integer as values

The code you have posted is valid Apex and reasonable. So the problem is either that some surrounding code is interfering - do you have something else called CharToNumber in any casing? - or that you are hitting a bug in the local compiler that is part of the Force.com IDE that you can ignore.

If you just need to initialize the map you can also use this more compact syntax for that:

map <String,Integer> CharToNumber = new map<String,Integer>{
        'A' => 0,
        'B' => 1
        };

that may work-around the problem.

Best Answer

Related Solutions

[SalesForce] Apex Class as Map Keys and Sets

[SalesForce] Declaring a map with String as keys and Integer as values

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