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public class RemoveWhiteSpace {
    public String remvoeWhiteSpaceFromString(String strVal) {
        return strVal.deleteWhitespace();
    }
}

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public class Fibonacci {
    public String getnerateFibbonaci(Integer num) {
        String fibobonaciSeries = 'Fibonacci Series: ';
        Integer f1 = 0, f2 = 1, nextNum = 0;
        for(Integer i=0;i<num;i++) {
                nextNum = f1 + f2;
                f1 = f2;
                f2 = nextNum;
                fibobonaciSeries += ', '+String.valueOf(nextNum);
        }

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public class LeapYear {
    public Boolean isLeapYear(Integer year) {
        Boolean isTrue = false;
        if ( math.mod(year,400) == 0 || math.mod(year,4) == 0)
            isTrue = true;
        return isTrue;
    }
}

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public class SwapNumbers {
    public void doNumSwapping(Integer a, Integer b) {
        a = a + b;
        b = a - b;
        a = a- b;
        system.debug('a value: '+a);
        system.debug('b value: '+b);
    }
}

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public class DynamicSobjectCreation {
    public static SObject createDynamicObject(String objectApiName) {        
        return (SObject)Type.forName(objectApiName).newInstance();
    }
    public static List createDynamicList4object(String objectApiName) {
        return (List)Type.forName('List<'+objectApiName+'>').newInstance();
    }
    /*** Usage ***
    List recs = DynamicSobjectCreation.createDynamicList4object('Contact');
    SObject rec1 = DynamicSobjectCreation.createDynamicObject('Contact');

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global class FieldsValidator implements Database.Batchable<Sobject> {
    global Database.queryLocator start(Database.BatchableContext bc) {
        return Database.getQueryLocator('select name, fields_info__c, fields_count__c from ObjectsExistingFieldsInfo__c');
    }
    global void execute(Database.BatchableContext bc, List<SObject> sobjLst) {
        String[] types = new String[]{'Account','Contact'};
        String emailBody = '';
        // Make the describe call
        Schema.DescribeSobjectResult[] results = Schema.describeSObjects(types);
        Map<String,List<Field>> objFieldsDesMap = new Map<String,List<Field>>();

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public class Demo_LightningSortableDatatableContrl {
	@AuraEnabled
    public static List<Sobject> fetchOpps(String sortField, String sortOrder) {
        String query = 'select id, name, stagename, amount from Opportunity';
        if(String.isNotBlank(sortField) && String.isNotBlank(sortOrder)) {
            query += ' order by '+sortField+' '+sortOrder;
        } 
        return Database.query(query);
    }
}

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<aura:component controller="Demo_LightningSortableDatatableContrl">
    <aura:attribute name="opportunities" type="list"/>
    <aura:attribute name="sortField" type="String" default="Name"/>
    <aura:attribute name="sortOrder" type="String" default="Asc"/>
    <aura:handler name="init" value="{!this}" action="{!c.doInit}"/>
    <table class="slds-table slds-table_bordered" role="grid">
      <thead>
        <tr class="slds-line-height_reset">          
          <th aria-sort="none" class="slds-is-sortable slds-text-title_caps" aria-label="Name" scope="col">
            <a class="slds-th__action slds-text-link_reset" href="javascript:void(0);" role="button" tabindex="-1" onclick="{!c.sortColumn}" id="Name" onmouseover="{!c.arrowOnHover}" onmouseout="{!c.arrowOnOut}">

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({
	doInit : function(component, event, helper) {
		helper.handleDoInit(component, event);
	},
    sortColumn : function(component, event, helper) {
        var target;
        if(event.currentTarget.id)
        	target = event.currentTarget.id;
        component.set("v.sortField",target);
        if(component.get("v.sortOrder")) {

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({
	handleDoInit : function(cmp, event) {
        var action = cmp.get("c.fetchOpps");
        action.setParams(
            { 
                sortField : cmp.get("v.sortField"),
                sortOrder : cmp.get("v.sortOrder")
            }
        );