Basic interpretation of the Quake light flicker in JavaScript.

quake_light_flicker.js

const flickerString = "mmamammmmammamamaaamammma";
const flickerInterval = 500;

const pauseExecution = (timeout) => {
  return new Promise((resolve) =>
    setTimeout(() => {
      resolve();
    }, timeout)
  );
}

const quakeLightFlicker = async () => {
  let index = 0;

  while (true) {
    await pauseExecution(flickerInterval);
    
    if (flickerString[index] === "a") {
      console.log("Current Pattern: a");

      // Presumably you could do something with lights here?
    } else {
      console.log("Current Pattern: m");
    }

    index = (index + 1) % flickerString.length;
  }
};

quakeLightFlicker();