Question

我有一个字符串数组，我需要根据每个字符串中的前4个数字对这些字符串进行排序。但是，如何针对这些数字进行排序？代码工作正常，我只需要对其进行排序。

我已经尝试过.substring，但是我认为这不是正确的方法。

var volunteers = [ '9.05', '16.29', '26.67', '0.00', '2.25' ]

getResults: function(volunteers) {
  this.results = [];
  for (var i = 0; i < volunteers.length; i++) {
    var dayNames = this.data[i][3] || " ";
    var result = (volunteers[i] + " additional volunteers are needed on day " + i +" " +dayNames);
    this.results.push(result);        
  }


console.log(this.results)
  return this.results;

}
//Expected
[ '26.67 additional volunteers are needed on day 2 Tuesday',
'16.29 additional volunteers are needed on day 1 Monday',
'9.05 additional volunteers are needed on day 0 Sunday',
'2.25 additional volunteers are needed on day 4 ',
'0.00 additional volunteers are needed on day 3 Wednesday' ]

//Actual
 [ '9.05 additional volunteers are needed on day 0 Sunday',
 '16.29 additional volunteers are needed on day 1 Monday',
 '26.67 additional volunteers are needed on day 2 Tuesday',
 '0.00 additional volunteers are needed on day 3 Wednesday',
 '2.25 additional volunteers are needed on day 4  ' ]

Answer 1

先排序：

SQL group by

Answer 2

您可以获取索引并按降序对它们进行排序，并使用排序后的索引映射字符串。

var volunteers = ['9.05', '16.29', '26.67', '0.00', '2.25'],
    days = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
    result = [...volunteers.keys()]
        .sort((a, b) => volunteers[b] - volunteers[a])
        .map(i => `${volunteers[i]} additional volunteers are needed on day ${i} ${days[i]}`);

console.log(result);

Answer 3

var volunteers = [ '9.05', '16.29', '26.67', '0.00', '2.25' ];

var days = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];

this.results = [];
for (var i = 0; i < volunteers.length; i++) {
  var result = {
    'value':volunteers[i] , 
    'name' : volunteers[i] + " additional volunteers are needed on day " + i +" " +days[i]
  }
  this.results.push(result);
}

this.results.sort(function(a, b) {
  return a.value - b.value;
}).reverse();

var result = this.results.map(a => a.name);

console.log(result);

Answer 4

尝试一下：

function getNumber(string) {
  const numbers = string.match(/[0-9\.]+/g)[0] || 0
  return Number(numbers);
}
function sort (volunteers) {
  return volunteers.sort((a, b) => getNumber(a) - getNumber(b));
}
sort(volunteers)

Answer 5

parseFloat可用于获取数字部分：

var arr = [ '9.05 additional volunteers are needed on day 0 Sunday',
           '16.29 additional volunteers are needed on day 1 Monday',
           '26.67 additional volunteers are needed on day 2 Tuesday',
            '0.00 additional volunteers are needed on day 3 Wednesday',
           '2.25 additional volunteers are needed on day 4' ]

console.log( arr.sort((a, b) => parseFloat(b) - parseFloat(a)) )

我需要帮助在字符串数组中对特定数字进行排序以进行降级

5 个答案: