Return Early From Function

• To avoid deep nesting of if-statements, always return a function's value as early as possible.

  // Dofunction isPercentage(val) {  if (val < 0) {    return false;  }  if (val > 100) {    return false;  }  return true;}
  // Avoidfunction isPercentage(val) {  if (val >= 0) {    if (val < 100) {      return true;    } else {      return false;    }  } else {    return false;  }}

• Or for this particular example it may also be okay to shorten things even further.

  function isPercentage(val) {  var isInRange = (val >= 0 && val <= 100);  return isInRange;}