Deleting both values from array if duplicate using lodash [duplicate]

Question

how to delete the duplicate value from the array.

var list =[1,1,5,5,4,9]

my result will be

var list =[4,9]

how can I do by using lodash

Have you tried anything? The lodash documentation is a good place to start — Andrew Li
– Andrew Li, Commented Dec 1, 2017 at 13:31
i tried with this _.uniqBy but i need to delete the duplicate value from the list — achu
– achu, Commented Dec 1, 2017 at 13:37

Nina Scholz · Accepted Answer · 2017-12-01 13:37:20Z

3

You could check the index and last index of the actual value.

var list = [1, 1, 5, 5, 4, 9],
    result = list.filter((v, _, a) => a.indexOf(v) === a.lastIndexOf(v));
    
console.log(result);

answered Dec 1, 2017 at 13:37

Nina Scholz

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1 Comment

achu Over a year ago

thank u for replay @Nina Scholz this want to happen in click function. if the value twice I want to delete it.

marvel308 · Accepted Answer · 2017-12-01 13:35:59Z

0

You can do

var list =[1,1,5,5,4,9];

let result = list.reduce((a, b) =>{
  a[b] = a[b] || 0;
  a[b]++;
  return a;
}, []).map((e, idx) => e==1? idx: undefined).filter(e => e);

console.log(result);

answered Dec 1, 2017 at 13:35

marvel308

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Comments

MBehtemam · Accepted Answer · 2017-12-01 13:42:43Z

0

you could use _.uniqBy()

  _.uniqBy(list ,function(m){
         return  list.indexOf(m) === list.lastIndexOf(m)
    })

edited Dec 1, 2017 at 13:42

answered Dec 1, 2017 at 13:33

MBehtemam

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