[1.10+] Ways to use executeCommand() from a player event

/*1.10 dummy ScriptBlock*/
var timerID = 128 /*must be unique*/
/*fill in the coordinated for the dummy block*/
/*WARNING: all NBT data of that block will be lost*/
var prev = {x:0,y:250,z:0};
/*you will have to store any "special" event properties in a global variable to access them from the timer*/
var proxy = {};
function toss(event) {
    proxy.item = event.item; /*storing Item in a global var*/
    /*saving the block at given coords*/
    prev.block = event.player.world.getBlock(prev.x,prev.y,prev.z);
    if(prev.block) {
        prev.id = prev.block.name;
        prev.meta = prev.block.getMetadata();
    }
    /*creating a ScriptBlock*/
    event.player.world.setBlock(prev.x,prev.y,prev.z,"customnpcs:npcScripted", 0);
    event.player.timers.stop(timerID);
    event.player.timers.start(timerID,1,false);
}
function timer(event) {
    if(event.id == timerID) {
        var dummy = event.player.world.getBlock(prev.x,prev.y,prev.z)
        /*commands go here*/
        dummy.executeCommand('/say '+proxy.item.displayName) /*using Item from toss event*/
        /*restoring the original block*/
        event.player.world.setBlock(prev.x,prev.y,prev.z,prev.id,prev.meta);
    }
}
/*-------------------------------*/
/*1.10+ using an NPC clone stored server-side*/
function toss(event) {
    /*fill in the tab and name of the saved clone*/
    var clone = {tab:0,name:"CommandDummy"}
    /*note that this doesnt spawn the npc into the world*/
    var dummy = event.player.world.getClone(clone.tab, clone.name);
    /*the command will be executed from NPC's position, defaults to 0,0,0*/
    dummy.setPosition(event.player.x,event.player.y,event.player.z);
    /*commands go here*/
    dummy.executeCommand('/say '+event.item.displayName);
}
/*-------------------------------*/
/*1.11+ with no clone setup required*/
/*functionally identical to the above*/
function toss(event) {
    var dummy = event.player.world.createEntity('customnpcs:customnpc');
    dummy.setPosition(event.player.x,event.player.y,event.player.z);
    dummy.executeCommand('/say '+event.item.displayName);
}