Looking to find missing information by comparing 2 arrays using LODASH

Question

I have 2 API requests that return 2 arrays(1 Array for each API request as result) for which have 1 common value i.e. timestamp.

I am looking to compare both the arrays and find which Array items is missing in either(get difference in 2 different arrays) using LODASH.

So for eg here are 2 sets of array

array1 =  [
    [
      1564482000000,
      30.5
    ],
    [
      1564482300000,
      null
    ],
    [
      1564482000020,
      30.5
    ]
]


array2 =  [
    [
      1564482000000,
      30.5
    ],
    [
      1564482300000,
      null
    ],
    [
      1564482000010,
      10.5
    ]
]

In above case Array 1 have following value that Array 2 doesn’t have

[ 1564482000020, 30.5 ]

Similarly , Array 2 have following value that Array 1 doesn’t have

[ 1564482000010, 10.5 ]

Expected Result I am looking to get result of missing value in 2 different arrays so

diff_array2 =     [
      1564482000020,
      30.5
    ]

diff_array1=     [
      1564482000010,
      10.5
    ]

I tried XORBY in Lodash it gives combine value so there is no way to find out which item was missing in Array 1 or Array 2 as the resulting array for XOR is 1 array. Items may or may not exist in either

Code sample here https://repl.it/repls/LateCorruptTypes

Answer 1

You could use differenceBy passing the index of the item to use for comparison as the iteratee:

const diff_array2 = _.differenceBy(array1, array2, 0);    

const diff_array1 = _.differenceBy(array2, array1, 0);