How to set defaultValue for multi select?

Question

I want to defaultvalue in multiple.But i can only fetch one value.How can i use Array in default value

{Details.map(Det=>
<Select 
defaultValue={{ label: Det.user_id, value: Det.user_id }}
placeholder={"Select Mates"}
onChange={this.dropdownhandleChange}
options={Dropdownlist.map(e => ({ label: e.Name, value: e.Id}))}
isMulti
 
/>
)}