How to convert lead using Salesforce Apex?

Lead myLead = new Lead(LastName = 'Foo', Company='Foo Bar');
insert myLead;

Database.LeadConvert lc = new database.LeadConvert();
lc.setLeadId(myLead.id);

LeadStatus convertStatus = [SELECT Id, MasterLabel FROM LeadStatus WHERE IsConverted=true LIMIT 1];
lc.setConvertedStatus(convertStatus.MasterLabel);

Database.LeadConvertResult lcr = Database.convertLead(lc);
System.assert(lcr.isSuccess());

trigger leadConversation on Lead (before update) {

LeadStatus convertStatus = [select MasterLabel from LeadStatus where IsConverted = true limit 1];

List<Database.LeadConvert> leadConverts = new List<Database.LeadConvert>();

for (Lead lead: Trigger.new) {

if (!lead.isConverted && lead.status== 'Closed - Converted') {

Database.LeadConvert lc = new Database.LeadConvert();

String oppName = lead.Name;

lc.setLeadId(lead.Id);

lc.setOpportunityName(oppName);

// Leadconvert.setDoNotCreateOpportunity(TRUE);

lc.setConvertedStatus(convertStatus.MasterLabel);

leadConverts.add(lc);

}

}

if (!leadConverts.isEmpty()) {

List<Database.LeadConvertResult> lcr = Database.convertLead(leadConverts);

System.debug(+'result'+lcr);

}

}

public class lead2webconvertHandler {

public static void leadInsert(List<lead> newRecords){
try {

list<database.leadconvert> listLeadConverts = new List<database.leadconvert>();
Database.LeadConvert leadObject = new Database.LeadConvert();
List<integer> IntList = new List<integer>{1,2,3};

for (Lead leads : newRecords) {
system.debug(leads);
if (leads.isConverted == false)
{

if(leads.LeadSource=='Web' && leads.Amount__c >=0)
{
leadObject.setLeadId(leads.Id);
leadObject.setOpportunityName(leads.Name);
leadObject.setConvertedStatus('Closed - Converted');
listLeadConverts.add(leadObject);
}
else{
if(leads.LeadSource=='Web')
{
leadObject.setLeadId(leads.Id);
leadObject.donotcreateopportunity = True;
leadObject.setConvertedStatus('Closed - Converted');
listLeadConverts.add(leadObject);
}
}
}
}
List<database.leadconvertresult> lcr = Database.convertLead(listLeadConverts);
System.debug('Done!!');

}catch (Exception e)
{
System.debug('Exception hit'+e.getMessage());
}
}

}</database.leadconvertresult></integer></integer></database.leadconvert></database.leadconvert></lead>

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