How do you show the map in the lightning component?

You can show map like below:
In component,
<aura:attribute name="mapVar" type="List" />
<aura:iteration items="{!v.mapVar}" var="map" >
key :- {!map.key} and Value :- {!map.value}
</aura:iteration>
<lightning:button label="CreateMap" onclick="{!c.doCreatemap}" />
In JS Controller,
({
doCreatemap : function(component, event, helper) {
var map = [];
for(var i=0; i<10; i++){
map.push({
key:i,
value:'Test' +i
});
}
component.set('v.mapVar',map);
}
})