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Code To: Iterate through Map in Salesforce

 string tempname='';
string tempdesc='';

 Map<String,String> mapObj = new Map<String,String>();

 For(String tempVarialbe: mapObj.ketset())
{
tempname= tempVarialbe; [To get the KEY VALUE]
tempdesc= mapObj.get(tempVarialbe); [Using Key value to get the corresponding VALUE]
}
Code To: Use 'Render' property in Visualforce page - Conditionally rendering 

 We can have a field evaluated based on multiple condition.

 Eg : <apex:inputField id="xxxif2" value="{!Object.Fieldtobedisplayed1}" rendered="{IF(Object.picklistfieldapiname1 ='picklist value 1' || lead.Buyer_Type__c ='picklist value 2' 

 ,true,false)}"/>

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