如果在Javascript中指定了十进制时间，如何计算最接近的整个时间单位

Question

例如，如果用户输入“ 2.5小时”或“ 65.2分钟”之类的文本，我想编写一个算法或一段代码，建议使用2.5小时，例如150分钟或150 * 60秒，等等。 。

Answer 1

Here a generic function that can convert to other time units with default to seconds

function convertTo(input, to='seconds'){
  const conversionToSeconds = {'seconds':1,'minutes': 60, 'hours': 60*60}

  const [timeValue, timeUnit] = input.trim().split(/ +/);
  const timeInSeconds = timeValue * conversionToSeconds[timeUnit];
  return timeInSeconds/conversionToSeconds[to]
}

examples:

> convertTo('2.5 hours')
9000
> convertTo('2.5 hours', 'minutes')
150

It works by trimming and splitting the string on one or more spaces ('3 hours' works as well).

Then the number is converted to number automatically through coercion when it is multiplied by the coefficient.

It first convert the number to seconds and then to the desired unit, using the same conversion map (pretty excited about this)

Things that can be done better:

• do not convert when already in the right unit
• convert in one step combining coefficients