webdaw-modules/src/util/time.ts

a set of modules for building a web-based DAW

const mPow = Math.pow;
const mRound = Math.round;
const mFloor = Math.floor;
const mRandom = Math.random;

// see also: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/round
export const round = (value: number, decimals: number): number => {
  if (typeof decimals === "undefined" || decimals <= 0) {
    return mRound(value);
  }
  const p = mPow(10, decimals);
  //console.log(p, decimals)
  return mRound(value * p) / p;
};

export const floor = (value: number, decimals: number): number => {
  if (typeof decimals === "undefined" || decimals <= 0) {
    return mFloor(value);
  }
  const p = mPow(10, decimals);
  //console.log(p,decimals)
  return mFloor(value * p) / p;
};

export const getNiceTime = (
  millis: number
): {
  hour: number;
  minute: number;
  second: number;
  millisecond: number;
  timeAsString: string;
  timeAsArray: [number, number, number, number];
  timeAsArrayString: [string, string, string, string];
} => {
  let timeAsString = "";

  const seconds = millis / 1000; // → millis to seconds
  const h = floor(seconds / (60 * 60), 0);
  const m = floor((seconds % (60 * 60)) / 60, 0);
  const s = floor(seconds % 60, 0);
  const ms = round((seconds - h * 3600 - m * 60 - s) * 1000, 0);

  timeAsString += h + ":";
  timeAsString += m < 10 ? "0" + m : m;
  timeAsString += ":";
  timeAsString += s < 10 ? "0" + s : s;
  timeAsString += ":";
  timeAsString += ms === 0 ? "000" : ms < 10 ? "00" + ms : ms < 100 ? "0" + ms : ms;


  const hS = `${h}`;
  const mS = m < 10 ? `0${m}` : `${m}`;
  const sS = s < 10 ? `0${s}` : `${s}`;
  const msS = ms === 0 ? "000" : ms < 10 ? `00${ms}` : ms < 100 ? `0${ms}` : `${ms}`;
  //console.log(h, m, s, ms);

  return {
    hour: h,
    minute: m,
    second: s,
    millisecond: ms,
    timeAsString: timeAsString,
    timeAsArray: [h, m, s, ms],
    timeAsArrayString: [hS, mS, sS, msS],
  };
};