Sample Code:

AccountListController.apex:

public class AccountListController {
   
    @AuraEnabled
    public static List < Account > fetchAccts() {
        return [ SELECT Id, Name, Industry, Type FROM Account LIMIT 10 ];
    }
   
}

AccountList.cmp:

<aura:component implements="force:appHostable"
                controller="AccountListController">
               
    <aura:attribute type="Account[]" name="acctList"/>
    <aura:attribute name="mycolumns" type="List"/>
   
    <aura:handler name="init" value="{!this}" action="{!c.init}"/>
   
    <lightning:datatable data="{! v.acctList }"
                         columns="{! v.mycolumns }"
                         keyField="Id"
                         hideCheckboxColumn="true"
                         onrowaction="{!c.handleRowAction}"/>
   
</aura:component>

AccountListController.js:

({
   
    init: function ( cmp, event, helper ) {
       
        var actions = [
            { label: 'Edit', name: 'edit' },
            { label: 'View', name: 'view' } ];

        cmp.set( 'v.mycolumns', [
            { label: 'Name', fieldName: 'Name', type: 'text' },
            { label: 'Industry', fieldName: 'Industry', type: 'text' },
            { label: 'Type State', fieldName: 'Type', type: 'text' },
            { type: 'action', typeAttributes: { rowActions: actions } } ] );

        var action = cmp.get( "c.fetchAccts" );
        action.setParams({
        });
        action.setCallback(this, function( response ) {
            var state = response.getState();
            if ( state === "SUCCESS" ) {
                cmp.set( "v.acctList", response.getReturnValue() );
            }
        });
        $A.enqueueAction( action );
       
    },

    handleRowAction: function ( cmp, event, helper ) {
       
        var action = event.getParam( 'action' );
        var row = event.getParam( 'row' );
        var recId = row.Id;

        switch ( action.name ) {
            case 'edit':
                var editRecordEvent = $A.get("e.force:editRecord");
                editRecordEvent.setParams({
                    "recordId": recId
                });
                editRecordEvent.fire();
                break;
            case 'view':
                var viewRecordEvent = $A.get("e.force:navigateToURL");
                viewRecordEvent.setParams({
                    "url": "/" + recId
                });
                viewRecordEvent.fire();
                break;
        }
    }
   
})

Output: