Скачать или смотреть Salesforce Development 101: Apex Fundamentals MasterClass

Salesforce Development 101: Apex Fundamentals MasterClass

Salesforce Apex Fundamentals In One Video

First Ever Apex Code --we are going to write some quick code, just to test how Apex works. For that,click on this debug menu and choose the first option, which is 'Open Execute Anonymous Window'.

The purpose of this window is, you can write some quick code here without creating the Apex Classes or the Apex Triggers.And, here we are going to write our very first Salesforce program, which is "Hello World".


Salesforce Development 101: Apex Fundamentals MasterClass

Variables and Heap --
Let's try to break down and understand the code that we've written in our video.
So, this was the debug statement that we have executed and as an output, we have got "Hello World" as a string in our debug logs. Now, how does Apex know that it has to print "Hello World"?

Why it did not print "System"?Why it did not print "Debug"?Why it only printed "Hello World" in the output?So, here 'system' and 'debug' are the key words that Apex already knows about, to be more precise,'system' is a class here and 'debug' is a method within that class.So, that's why Apex did not print these two statements. But why it printed "Hello World"?The key here is these quotation marks.
So, if you write anything within the single quotes, the Apex will treat that statement as a string and the system.debug method accepts a string that it can print in the output.

Salesforce Development 101: Apex Fundamentals MasterClass
Primitive Data Types

Salesforce Development 101: Apex Fundamentals MasterClass
String Class Methods

Salesforce Development 101: Apex Fundamentals MasterClass

Escape Character
Adding Comments in Code
List Datatype
Set Datatype
Map Data Type
Collections in Apex
Safe Navigation Operator
Null Coalescing Operator
Data Type Conversion