You can iterate a map by key or value: Key for (String key : m.keySet ()) { Object value = m.get (key); }
Table of Contents
How to iterate through the contents of a map?
I don’t think you can iterate through the contents of a Map directly. You can put the Map contents into a Set or List and then do your loop. Hope that helps.
Why is my map not working in Salesforce?
The code creating that Map has a bug in it – usually, this happens when you forget to create a new object instance in each iteration of a loop that’s generating a nested data structure. Thanks for contributing an answer to Salesforce Stack Exchange!
Why can’t I iterate over the keys of the inner map?
There’s no reason to iterate over the keys of the inner Map. While you could make that work, you’d end up with a complex if / else or switch on statement inside the inner for loop. It’s much easier to directly access the inner Map keys whose values you require.
How do I transform a map to a list of objects?
If you have no choice but to start with a map in the controller, you can transform it to a list of objects something like this: var listOfObjects = Object.keys (myMap).map (function (key) {return {name: key, value: myMap [key]} }). Show activity on this post.
How do I iterate over an apex map?
There are many methods that can be used in Apex. One method in particular can be used to loop through a map in Apex, this method is keySet(). The keyset method returns all of the keys in the map and you can access the value associated with the key inside a loop.
How do you iterate a map in lightning component?
Here you go….. In this apex class ,you have @AuraEnabled , fetchMapvalues() method which return type is Map type….Iterate map values in Salesforce Lightning component.Attribute NameTypeDescriptionitemsListRequired. The collection of data to iterate over.varStringRequired. The variable name to use for each item inside the iteration.2 more rows•Sep 15, 2018
How do I show map values in Salesforce?
Apex Map In SalesForceLog into your Salesforce account and click the “Developer Console”.The general syntax for Apex Map is, … Next, we can add some predefined important methods like put(key, value), get(key), keySet(), values(), size(), clone(), and clear() to the Apex Map.More items…•
What is keySet in MAP in Salesforce?
keySet() Returns a set that contains all of the keys in the map. put(key, value) Associates the specified value with the specified key in the map.
Can we use map in lightning component?
First we create our component controller class. In this apex class we have a @AuraEnabled getMyMap() method which return type is Map type. In this method first we created a new map called Mymap and put value on it . (‘key’ , ‘value’) and return the map.
How do you use the map in lightning controller?
Case 2) Displaying map by using aura iteration.STEP 1) APEX Controller,STEP 2) Create a lightning component (name=”mapIteration. … STEP 3) mapIterationController.js. … STEP 4) Create a lightning component name=”mapIterationChild. … STEP 5) mapIterationChildController.js.STEP 6) Application to run the above component.More items…•
How do you find the value of a map?
HashMap get() Method in Java get() method of HashMap class is used to retrieve or fetch the value mapped by a particular key mentioned in the parameter. It returns NULL when the map contains no such mapping for the key.
How do I compare two map values in Salesforce?
The correct way to compare maps for value-equality is to:Check that the maps are the same size(!)Get the set of keys from one map.For each key from that set you retrieved, check that the value retrieved from each map for that key is the same (if the key is absent from one map, that’s a total failure of equality)
How do I access map elements in Apex?
To access elements in a map, use the Map methods provided by Apex. This example creates a map of integer keys and string values. It adds two entries, checks for the existence of the first key, retrieves the value for the second entry, and finally gets the set of all keys.
Can map have duplicate keys?
Duplicate keys are not allowed in a Map. Basically, Map Interface has two implementation classes HashMap and TreeMap the main difference is TreeMap maintains an order of the objects but HashMap will not.
Why .keySet is used?
keySet() method in Java is used to create a set out of the key elements contained in the hash map. It basically returns a set view of the keys or we can create a new set and store the key elements in them.
Can map have duplicate keys in Salesforce?
Features of Map KEY can’t be duplicate like SET. VALUE can be duplicate like LIST. We can have keys or values of any data type (eg: string, integer, etc).