Deleting both values from array if duplicate using lodash

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, Dec 01 '17 at 13:31
i tried with this `_.uniqBy` but i need to delete the duplicate value from the `list` — achu, Dec 01 '17 at 13:37

score 3 · Answer 1 · answered Dec 01 '17 at 13:37

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 01 '17 at 13:37

Nina Scholz

376,160
25
347
392

thank u for replay @Nina Scholz this want to happen in click function. if the value twice I want to delete it. – achu Dec 01 '17 at 13:48

MBehtemam · Answer 2 · 2017-12-01T13:42:43.620

0

you could use _.uniqBy()

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

edited Dec 01 '17 at 13:42

answered Dec 01 '17 at 13:33

MBehtemam

7,865
15
66
108

score 0 · Answer 3 · answered Dec 01 '17 at 13:35

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 01 '17 at 13:35

marvel308

10,288
1
21
32

Deleting both values from array if duplicate using lodash

3 Answers3