JavaScript：日期时间字符串格式的数字数组

Question

I have an array of number

var year = [1999,2000,2001,2002,2003];

and I need to convert to date-time formar

var yearConvert =["1999-00-00","2000-00-00","2001-00-00","20002-00-00","2003-00-00"];

I only have year which is an integer

Answer 1

You can use map and concat -00-00 on each element

 var year = [1999,2000,2001,2002,2003]; let op = year.map(e => e+'-00-00') console.log(op)

Answer 2

You can use Array#map to do it. But the returned array will have the values as string not as Date object.

 const year = [1999,2000,2001,2002,2003]; const dateString = year.map((ele) => `${ele}-00-00`); console.log(dateString); //Convert this array to Date Objects using Date constructor Date(year, monthIndex, day) month starts from '0' const date = dateString.map((str) => { const data = str.split('-'); return new Date(data[0], data[1], data[2]+1); }); console.log(date) //To verify parse to date strings const dateParsed = date.map((date) => date.toDateString()); console.log(dateParsed);

Answer 3

You could use a IIFE generator function with the spread syntax and yield each value into an array like so:

 const year = [1999,2000,2001,2002,2003], yearConvert = [...(function*(a){ for(y of a) yield `${y}-00-00`; })(year)]; console.log(yearConvert);