How to name this pattern? Does similar exist? Queue of triggered callback -

i'll need name or identify existing pattern that. application i'm developing need create queue of callbacks fired event. once event triggered, consecutive callbacks added queue fired immediately.

in code like that:

var queue = new triggeredcallbackqueue();  queue.ontriggerornow(() => console.log('callback 1'));  // nothing logged console  queue.ontriggerornow(() => console.log('callback 2')); // nothing logged console  queue.trigger();    // 'callback1' , 'callback 2' logged console  queue.ontriggerornow(() => console.log('callback 3'));   // 'callback 3' logged console  queue.ontriggerornow(() => console.log('callback 4'));   // 'callback 4' logged console 

do know if such pattern exists , classified anywhere? how name it? think triggeredcallbackqueue name?

i think it's promise design pattern, changed api:

class triggeredcallbackqueue {    constructor() {      this.promise = new promise((res, rej) => {        this._res = res;        this._rej = rej;      });    }      trigger() {      this._res();    }      ontriggerornow(cb) {      this.promise = this.promise.then(cb);    }  }    var queue = new triggeredcallbackqueue();    queue.ontriggerornow(() => console.log('callback 1'));  // nothing logged console    queue.ontriggerornow(() => console.log('callback 2'));  // nothing logged console    settimeout(() => {    queue.trigger(); // 'callback1' , 'callback 2' logged console  }, 2000);    settimeout(() => {    queue.ontriggerornow(() => console.log('callback 3'));    // 'callback 3' logged console      queue.ontriggerornow(() => console.log('callback 4'));    // 'callback 4' logged console  }, 4000);    settimeout(() => {    queue.trigger(); // nothing happens  }, 5000);