如何创建一个半小时间隔的数组，而不是在变量中声明 [英] how to create an array of times with half hour intervals instead of declare in variable

问题描述

我有一个像这样的长const值，是否可以在typescript中创建函数来减少长const。

i have an long const values below like this ,is it possible to create in function in typescript to reduce a long const.

export const DepartTime = 
['00.00', '00.30', '01.00', '01.30', '02.00', '02.30', '03.00', '03.30', '04.00', '04.30', '05.00', '05.30', '06.00', '06.30', '07.00', '07.30', '08.00', '08.30', '09.00', '09.30', '10.00', '10.30', '11.00', '11.30', '12.00', '12.30', '13.00',
'13.30', '14.00', '14.30', '15.00', '15.30', '16.00', '16.30', '17.00', '17.30', '18.00', '18.30', '19.00', '19.30',
'20.00', '20.30', '21.00', '21.30', '22.00', '22.30', '23.00', '23.30'
];

这些值需要在角度下拉列表中绑定。

These values need to be bind in angular dropdown.

export class SelectOverviewExample implements OnInit {
  days=[];
  times =[];


ngOnInit(){
  [...this.days] = weekdays;
  [...this.times]=DepartTime;
}

in html。

<mat-form-field>
  <mat-select placeholder="select Weekdays">
    <mat-option *ngFor="let time of times" [value]="time">
      {{time}}
    </mat-option>
  </mat-select>
</mat-form-field>

或任何第三方框架将支持

or any third party framework will support

我试过这个并得到以下结果：

I have tried this and getting below result:

var toInt  = time => ((h,m) => h*2 + m/30)(...time.split(':').map(parseFloat)),
    toTime = int => [Math.floor(int/2), int%2 ? '30' : '00'].join(':'),
    range  = (from, to) => Array(to-from+1).fill().map((_,i) => from + i),
    eachHalfHour = (t1, t2) => range(...[t1, t2].map(toInt)).map(toTime);

console.log(eachHalfHour('00:00', '23:30'))

但是我需要一位数字从00：00,00：30,01.00,01.30 ... 09.30开始。
O / p

But i need single digit have start with 00:00,00:30,01.00,01.30 ... 09.30. O/p

通过使用时刻js，我得到了一个解决方案，但需要0前缀为单数字

by using moment js , i have get a solution but need 0 prefix for single digits

const locale = 'en'; // or whatever you want...
const hours = [];

moment.locale(locale);  // optional - can remove if you are only dealing with one locale

for(let hour = 0; hour < 24; hour++) {
    hours.push(moment({ hour }).format('H:mm'));
    hours.push(
        moment({
            hour,
            minute: 30
        }).format('H:mm')
    );

}
  console.log(hours);

推荐答案

下面代码对我有用我尝试过使用 https：// stackoverflow .com / a / 8043061/9516784

Below code works for me I have tried using https://stackoverflow.com/a/8043061/9516784

    var hrs = [];
    for (var i = 0; i <= 48; i++) {
      var n = i%2==0 ? i/2+'.00' : (i+1)/2-1+'.30';
      if(n<10) {
        n = '0'+n;
      }   
      hrs.push(n);
    }

这篇关于如何创建一个半小时间隔的数组，而不是在变量中声明的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！