What is containsKey in Salesforce?

What is containsKey in Salesforce?

Makes a duplicate copy of the map. containsKey(key) Returns true if the map contains a mapping for the specified key. deepClone() Makes a duplicate copy of a map, including sObject records if this is a map with sObject record values.

Is containsKey faster than get?

It takes approximately the same amount of time to call get and containsKey, and it’s virtually guaranteed that after you call containsKey, you’re going to call get anyways, so you may as well cut out the middle man.

What are the methods of map in Salesforce?

How to use Map methods in Salesforce

• Creating a Map: Map variablename=new Map();
• Different Methods in Map:
• put(key, value): It returns the value with given key in the map.
• clear(): It removes all the key-value mapping pairs from the map.
• get(key):
• keySet():
• values():
• size():

How do I compare two map values in Salesforce?

The correct way to compare maps for value-equality is to:

1. Check that the maps are the same size(!)
2. Get the set of keys from one map.
3. 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)

What is the significant difference between containsKey () and get ()?

get(Object) does explicitly warn about the subtle differences between Map. get(Object) and Map. containsKey(Object) : If this map permits null values, then a return value of null does not necessarily indicate that the map contains no mapping for the key; it’s also possible that the map explicitly maps the key to null .

Can we have duplicate keys in map?

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. HashMap allows null values and null keys. Both HashSet and HashMap are not synchronized.

Can map contains null values?

Map doesn’t allow duplicate keys, but it allows duplicate values. HashMap and LinkedHashMap allows null keys and null values but TreeMap doesn’t allow any null key or value. Map can’t be traversed so you need to convert it into Set using keySet() or entrySet() method.

What are the governor limits in Salesforce?

Major Governor Limits

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).

Can a map key be null?

This class is found in java. If you try to insert the duplicate key, it will replace the element of the corresponding key. HashMap is similar to HashTable, but it is unsynchronized. It allows to store the null keys as well, but there should be only one null key object and there can be any number of null values.

What is the difference between hash map and hash table?

One of the major differences between HashMap and Hashtable is that HashMap is non-synchronized whereas Hashtable is synchronized, which means Hashtable is thread-safe and can be shared between multiple threads but HashMap can not be shared between multiple threads without proper synchronization.

Can Map have null keys?