Removing duplicate arrays of an array : javascript

Question

I am working with javascript arrays, where i have an array of arrays like,

var arr = [ 
  [ 73.0191641, 33.5720131 ],
  [ 73.0191641, 33.5720131 ],  
  [ 3.0191641, 33.5720131 ],
  [ 73.0191641, 33.5720131 ],
  [ 73.0191641, 33.5720131 ],
  [ 73.0192222, 33.5778921 ],
  [ 73.0192222, 33.5778921 ]];

There, i needed to remove the duplicate arrays. I have tried this method but it didn't worked for me, may be i am missing or doing something wrong.

var distinctArr = Array.from(new Set(arr));

Although this method works only for array of objects. If someone can help, please do help. Thanks for your time.

Possible duplicate of [Unique values in an array](http://stackoverflow.com/questions/1960473/unique-values-in-an-array) — Ivanka Todorova, May 10 '17 at 09:43
Specify your problem because I guess you want to remove **whole rows** of this array of arrays, not separate elements. If so - it's not a dupe. — kind user, May 10 '17 at 09:54

score 3 · Answer 1 · answered May 10 '17 at 09:45

Lodash is great lib for doing this little things.

uniqWith with compare isEqual should resolve your problem.

var arr = [ 
  [ 73.0191641, 33.5720131 ],
  [ 73.0191641, 33.5720131 ],  
  [ 3.0191641, 33.5720131 ],
  [ 73.0191641, 33.5720131 ],
  [ 73.0191641, 33.5720131 ],
  [ 73.0192222, 33.5778921 ],
  [ 73.0192222, 33.5778921 ]];

_.uniqWith(arr,_.isEqual)

return -> [Array(2), Array(2), Array(2)]

kind user · Accepted Answer · 2017-05-10T15:26:01.330

1

You can use following approach.

var arr = [ { person: { amount: [1,1] } }, { person: { amount: [1,1] } }, { person: { amount: [2,1] } }, { person: { amount: [1,2] } }, { person: { amount: [1,2] } }];

   hash = [...new Set(arr.map(v => JSON.stringify(v)))].map(v => JSON.parse(v));
   
   document.write(`<pre>${JSON.stringify(hash, null, 2)}</pre>`);

edited May 10 '17 at 15:26

answered May 10 '17 at 09:46

kind user

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Thanks for the help, it really worked. any idea what should be done for the array of kind var array = [ { person: { amount: [1,1] } }, { person: { amount: [1,1] } }, { person: { amount: [2,1] } }, { person: { amount: [1,2] } }, { person: { amount: [1,2] } }]; ?? – Suhail Mumtaz Awan May 10 '17 at 12:55
1

@SuhailMumtazAwan Do you still have problem with this? – kind user May 10 '17 at 14:56
No, not at all. – Suhail Mumtaz Awan May 10 '17 at 15:08

Removing duplicate arrays of an array : javascript

2 Answers2