Help with a JavaScript algorithm!

Question

Tryin to create a function called clockHandAngles(seconds) that, given the number of seconds since 12:00:00, will print the angles (in degrees) of the hour, minute and second hands. For an input parameter seconds of 119730 (equivalent to 9:15:30 plus 24 hrs!), I am trying to log "Hour Hand: 277.75 degs. Minute Hand: 93 degs. Second Hand: 180 degs.". The angle for the minute hand is not simply 90 degrees; it has advanced a bit further, because of the additional 30 seconds in that minute so far. So far I have got it to display the number of hrs, min, and sec. I can't figure out how to do the rest. Remember everytime it passes the 12 o'clock, or 360 degrees, it resets to 0.

const clockHandAngles = seconds => {
    let counts = [0, 0, 0, seconds];
    let denominations = [3600, 60, 1];
    for(let i = 0; i < 3; i++){    
        counts[i] = Math.floor(counts[3] / denominations[i]);
        counts[3] -= counts[i] * denominations[i];
    }
    console.log(`Hour Hand: ${counts[0]} degs, Minute Hand: ${counts[1]} degs, Second Hand: ${counts[2]} degs`);
};
clockHandAngles(119730)

Answer 1 · 2017-11-30T22:26:43Z

November 30, 2017 10:26pm

You probably don't want to apply the floor function in the first calculation, but use it in the second one instead. You also need to apply a scaling factor to convert from units (minutes, seconds, etc) to degrees, and finally limit each value to 360 degrees.

  let scaling = [30, 6, 6];
  for (let i = 0; i < 3; i++) {
    counts[i] = counts[3] / denominations[i] * scaling[i] % 360;
    counts[3] -= Math.floor(counts[i]/scaling[i]) * denominations[i];
  }

Now please tell me I did not just do your homework!

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Robert Amato

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Help with a JavaScript algorithm!

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