Clamp a number to be in a range. You can also use this to clamp an array of numbers (like an rgb array for example)

clampNum.jsx

function ClampNum(num, min, max, inErrReturn) {
  function SingleChannelClamp(num, min, max) {
    if (
      isNaN(num) ||
      min == undefined ||
      isNaN(min) ||
      isNaN(max) ||
      max == undefined
    ) {
      return num;
    }
    if (num <= min) {
      return min;
    } else if (num >= max) {
      return max;
    } else {
      return num;
    }
    return num;
  }
  if (min == undefined || max == undefined) {
    return num;
  } else if (num == undefined) {
    if (inErrReturn !== undefined) {
      return inErrReturn;
    }
    return 0;
  }

  if (num.length >= 1) {
    var finalArr = [];
    for (var nm = 0; nm < num.length; nm++) {
      finalArr.push(SingleChannelClamp(num[nm], min, max));
    }
    return finalArr;
  } else {
    return SingleChannelClamp(num, min, max);
  }
};