Lightning - Helper method

Helper method

If there is any reusable code available then we will keep the code in helper and use it in controller
We can't directly call helper methods from component
Helper methods runs in different threads. Hence better performance

Component
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<aura:component >
    <aura:attribute name="empName" type="String" />
    <aura:attribute name="age" type="Integer" />
    <aura:attribute name="salary" type="Decimal" />
    <aura:attribute name="bonus" type="Decimal" />
   
   <div class="box">
    <lightning:card title="HelperMethod">
    	<aura:set attribute="actions">
        	<lightning:button label="submit" onclick="{!c.show}" />
    		<lightning:button label="Cancel" onclick="{!c.callMe}" />
        </aura:set>
        <aura:if isTrue="{!v.age>0}" >
            Name : {!v.empName} <br/>
            Age  :{!v.age} <br/>
            Salary:{!v.salary} <br/>
            Bonus:{!v.bonus}
            <aura:set attribute="else">
            	Loading...
            </aura:set>
        </aura:if>
    </lightning:card>
   </div> 
</aura:component>
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Controller
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({
		show: function(component, event, helper) {
            helper.myHelper(component);
		    var age =component.get("v.age");
            var salary,bonus;
            if(age > 30){
                salary=50000;
                bonus=3000;
            }else{
                salary=40000;
                bonus=5000;
            }
            console.log('Salary:'+salary);
            console.log('Bonus:'+bonus);
            component.set("v.salary",salary);
            component.set("v.bonus",bonus);
	},
    callMe:function(component, event, helper){
        helper.myHelper(component);
        var age=component.get("v.age");
        var salary,bonus;
        if(age > 50){
            salary=90000;
            bonus=1111;
        }else{
            salary=55555;
            bonus=2222;
        }
        console.log('Salary:'+salary);
        console.log('Bonus:'+bonus);
        component.set("v.salary",salary);
        component.set("v.bonus",bonus);
    }
})
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Helper
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({
	myHelper : function(component) {
		var empName=component.get("v.empName");
        var age=component.get("v.age");
        if(empName==null){
            empName='Satish';
            component.set("v.empName",empName);
        }
        if(age ==null){
            age=40;
            component.set("v.age",age);
        }
        console.log('Age :'+age);
        console.log('Name:'+empName);
	}
})
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Style
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.THIS.box {
    width:500px;
    height:300px;
    margin-left:100px;
    margin-top:100px;
    padding:20px;
    border:1px solid grey;
}
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