Salesforce Development Learning

Web Application:

Frond End: which user view/see websites/Applications.

Back End: By using backend applications and database servers users can perform operations.

Ex: Amazon, Flipkart, Yesbank, Titan etcs.

Web Technologies:

Salesforce user interfaces:

1. Classic-before 2014

2. Lightning-2014

Front Salesforce technologies:

1. Classic: Visualforce Pages.

2. Lightning: Aura Components and Lightning web components.

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Apex Fundamentals:

System.debug('Hey I wrote code finally buddy');

or

String greeting = 'My code';

system.debug('greeting');

things to know here:

system.debug(); system-defined method used to printable statements

string = datatype represents character values

greeting= variable

//////////////////////////////////////////////////////////////////////////////////////////////////////

Datatypes in Apex:

1. Primitive

2. Collections

3. Sobjects

4. Enum

Primitive datatypes Examples:

String:

String name = ' Monster';

system.debug('name');

Integer:

Integer barrelNumbers = 1000;

system.debug(' value of barrelNumbers variable: '+barrelNumbers);

Boolean:

Boolean shipmentDispatched;

shipmentDispatched = true;

System.debug('Value of shipmentDispatched '+shipmentDispatched);

Date:

Date ShipmentDate = date.today();

System.debug('ShipmentDate '+ShipmentDate);

Long:

Long companyRevenue = 21474838973344648L;

system.debug('companyRevenue'+companyRevenue);

Collection Datatypes in Apex:

1. List:

To have a list of values we will use a list. List contains duplicate values also.

integer num1=13;

system.debug(num1);

integer num2=14;

system.debug(num2);

integer num3=15;

system.debug(num3);

///////////////////////////////////////////

list<integer> num = new list<integer>{13,14,15};

system.debug(num);

num.add(16);

num.add(17);

num.add(18);

system.debug(num);

To remove number from index: num.remove(2);    /// Method is remove()

To get number from index:  num.get(2);                 /// Method is get()

To add number from index: num.add(2,20);           /// Method is add(index, number)

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

integer num = 123;

system.debug('number is :' +num);

string name = 'Ravi';

system.debug('Name is :' +name);

decimal value = 123.45;

system.debug('Decimal value is: ' +value);

date mydate = date.today();

system.debug('Today date is: '+ mydate);

system.debubg(date.today());

Boolean bol = true;

system.debug('Boolean value' +bol);

list<integer> num = new list<integer>{14,15};

num.add(16);

system.debug(num);

list<string> names = new list<string>{'Ravi','Kiran'};

names.add('Ahmed');

system.debug(names);

set<integer> dup = new set<integer>{12,13,14,15,12};

system.debug(dup);

dup.add(17);

system.debug(dup);

dup.add(14);

system.debug(dup);

set<string> dup1 = new set<string>{'Ravi','Ahmed','San'};

system.debug(dup1);

dup1.add('Ravi');

system.debug(dup1);

map<integer,string> mapvalue = new map<integer,string>();

mapvalue.put(12,'Ravi');

mapvalue.put(13,'Ahmed');

mapvalue.put(14,'Chandra');

mapvalue.put(16,'Test');

system.debug(mapvalue);

/// to get all key ///

set<integer> newset = mapvalue.keyset();

system.debug(newset);

/// to get all values///

list<string> newnames = mapvalue.values();

system.debug(newnames);

\\\\\\\\\\\\\  List, Set, Map\\\\\\\\\\\\\

///////////// LIst /////////

List<integer> num = new list<integer>();

num.add(12);

num.add(13);

system.debug(num);

///////// Set /////////

set<string> names = new set<string>();

names.add('Ravi');

names.add('ahmed');

system.debug(names);

///////////// Map //////

map<integer, string> empnamenum = new map<integer,string>();

empnamenum.put(12,'Ravi');

empnamenum.put(13,'Kiran');

empnamenum.put(14,'Ahmed');

system.debug(empnamenum);

set<integer> number1 = empnamenum.keyset();

system.debug(number1);

system.debug(empnamenum.keyset());

list<string> namess = empnamenum.values();

system.debug(namess);

system.debug(empnamenum.values());