How to get alert when a Picklist value is selected in Lightning Component

Hi, here we have shown the alert message when we select the available picklist values…

Lightning Component : Basic4

<aura:component >
    <aura:attribute name="selectoption" type="string"/>
    <lightning:select label="select Name" value="{!v.selectoption}" onchange="{!c.Selected}">
        <option>--None--</option>
        <option>salesforce</option>
        <option>salesforceCodes</option>
        <option>Test</option>
        <option>Test1</option>    
    </lightning:select>
</aura:component>

Controller Js

({
	Selected : function(component, event, helper) {
		var select = component.get('v.selectoption');
        alert('You have selected : '+select);        
	}
})

Application

<aura:application extends="force:slds" >
    <c:Basic4/>
</aura:application>

Output

select one value from picklist then alert will be displayed with selected value..

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