As with lists, you can populate map key-value pairs when the map is declared by using curly brace ({}) syntax. Within the curly braces, specify the key first, then specify the value for that key using =>. For example:
Full Answer
What is a map in Salesforce?
A map is a collection of key-value pairs where each unique key maps to a single value. Keys and values can be any data type—primitive types, collections, sObjects, user-defined types, and built-in Apex types. This table represents a map of countries and currencies: Map keys and values can contain any collection, and can contain nested collections.
How does geocoding work in Salesforce maps?
The first time a record is geocoded (This is done when you run a query or run a batch), Salesforce Maps will populate the empty Latitude and Longitude fields and save them on the record page, thus modifying the record.
What are the latitude and longitude fields in Salesforce maps?
During the configuration process, Salesforce Maps will create Latitude and Longitude fields for each base object that is configured. These fields are where latitude/longitude coordinates are stored to increase the speed of future map/marker interactions.
How does the map method work?
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. For more information, including a complete list of all supported Map methods, see Map Class.
How many levels of nested collections can a map contain?
Map keys can contain up to only four levels of nested collections. To declare a map, use the Map keyword followed by the data types of the key and the value within <> characters. For example: You can use the generic or specific sObject data types with maps. You can also create a generic instance of a map.
What is a map in Apex?
A map is a collection of key-value pairs where each unique key maps to a single value. Keys and values can be any data type—primitive types, collections, sObjects, user-defined types, and built-in Apex types.
Can you use generic data types with maps?
You can use the generic or specific sObject data types with maps. You can also create a generic instance of a map. As with lists, you can populate map key-value pairs when the map is declared by using curly brace ( {}) syntax. Within the curly braces, specify the key first, then specify the value for that key using =>.
Does Apex need to reference the algorithm?
Unlike Java, Apex developers do not need to reference the algorithm that is used to implement a map in their declarations (for example, HashMap or TreeMap ). Apex uses a hash structure for all maps.
Can you use map keys in the same order?
You can rely on the order being the same in each subsequent execution of the same code. However, we recommend to always access map elements by key. A map key can hold the null value. Adding a map entry with a key that matches an existing key in the map overwrites the existing entry with that key with the new entry.
How to tell if two maps are equal?
Two maps are equal if their key/value pairs are identical, regardless of the order of those pairs. The == operator is used to compare the map keys and values. The == operator is equivalent to calling the equals method, so you can call map1.equals (map2); instead of map1 == map2;.
Is a map key case sensitive?
Map keys of type String are case-sensitive. Two keys that differ only by the case are considered unique and have corresponding distinct Map entries. Subsequently, the Map methods, including put, get, containsKey, and remove treat these keys as distinct. For more information on maps, see Maps. Map Constructors.
