Removing array duplicates based on second array item value

Question

I'm trying to remove duplicates array's items (which are nested array's items) by comparing each of the second value (the date nested item, eg: From 22/07/21 10:00 to 22/07/21 12:00).

I'm struggling with it because the third nested item's value is a random string of character. Any help is appreciated.

Initial array:

[
  ['F-GMXB', 'From 22/07/21 10:00 to 22/07/21 12:00', 'M8202042500022072100000007'],
  ['F-HMRT', 'From 26/07/21 07:00 to 27/07/21 22:00', 'M8802052500023072100000004'],
  ['F-HMRT', 'From 26/07/21 07:00 to 27/07/21 22:00', 'M28681025000260C2100148836'],
  ['F-HMRT', 'From 26/07/21 07:00 to 27/07/21 22:00', 'M2868102500026072100128886'],
]

Expected result, new array:

[
  ['F-GMXB', 'From 22/07/21 10:00 to 22/07/21 12:00', 'M8202042500022072100000007'],
  ['F-HMRT', 'From 26/07/21 07:00 to 27/07/21 22:00', 'M8802052500023072100000004'],
]

Spectric · Accepted Answer · 2021-07-22 00:56:15Z

1

You can store the previous dates in an array (a) and use Array#filter to check whether it includes it or not:

^{If it doesn't, add the date to the array}

const arr = [['F-GMXB', 'From 22/07/21 10:00 to 22/07/21 12:00', 'M8202042500022072100000007'],['F-HMRT', 'From 26/07/21 07:00 to 27/07/21 22:00', 'M8802052500023072100000004'],['F-HMRT', 'From 26/07/21 07:00 to 27/07/21 22:00', 'M28681025000260C2100148836'],['F-HMRT', 'From 26/07/21 07:00 to 27/07/21 22:00', 'M2868102500026072100128886']];

var a = [], res = arr.filter(e => !a.includes(e[1]) ? a.push(e[1]) : false);

console.log(res);

answered Jul 22, 2021 at 0:56

Spectric

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1 Comment

amarinediary Over a year ago

Oh i see. My idea at firs was to get the position of each duplicated date and remove each key based on that. But your way is really ingenious! Thanks a lot for the help!

Mister Jojo · Accepted Answer · 2021-07-22 01:23:16Z

0

You can also do that

const arr1 =
[ ['F-GMXB', 'From 22/07/21 10:00 to 22/07/21 12:00', 'M8202042500022072100000007']
, ['F-HMRT', 'From 26/07/21 07:00 to 27/07/21 22:00', 'M8802052500023072100000004']
, ['F-HMRT', 'From 26/07/21 07:00 to 27/07/21 22:00', 'M28681025000260C2100148836']
, ['F-HMRT', 'From 26/07/21 07:00 to 27/07/21 22:00', 'M2868102500026072100128886']
]
const arr2 =  arr1.filter(( c,i,{[i-1]:p})=>( !i || c[1]!=p[1])  )
 

console.log(arr2)

.as-console-wrapper {max-height: 100%!important;top:0 }

answered Jul 22, 2021 at 1:23

Mister Jojo

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