JavaScript - Filter two arrays with similar objects

Question

I'm trying to compare results from two different arrays containing similar strings;

Array1:

A350.1 - 2h 46 m
A210.2 - 3h 46 m

Array2:

A450.3 - 8h 0 m
A440.5 - 13h 0 m
A450.1 - 4h 0 m
A350.1 - 1h 45 m
A320.7 - 3h 45 m

So I would need to filter out A350.1 - 2h 46 m from Array1 since there's a similar object A350.1 - 1h 45 m in Array2

The results should look like this from the filtered array, only removing the object which has the identical name (in this example A350.1):

A210.2 - 3h 46 m

Any way I could do this effectively and push the results in a new filtered array?

Is it a string array? ["A350.1 - 2h 46 m", "A210.2 - 3h 46 m"]? or arrays with objects? Can you write down the exact array here in Javascript? — sabithpocker
– sabithpocker, Commented May 9, 2017 at 10:33
@sabithpocker I'm pushing these objects to an empty array (Array1, Array2) from a JSON response. — IlariM
– IlariM, Commented May 9, 2017 at 10:36
So if there is a conflict, item from array2 is taken always? Can you explain what you are trying to do here? — sabithpocker
– sabithpocker, Commented May 9, 2017 at 10:40

Yashar Aliabbasi · Accepted Answer · 2017-05-09 10:42:46Z

2

try this:

var arr1 = ["A350.1 - 2h 46 m", "A210.2 - 3h 46 m"]
var arr2 = ["A450.3 - 8h 0 m",
  "A440.5 - 13h 0 m",
  "A450.1 - 4h 0 m",
  "A350.1 - 1h 45 m",
  "A320.7 - 3h 45 m"
]
var firstPart = [];
arr1.forEach(function(obj1) {
  firstPart.push(obj1.substring(0, obj1.indexOf('-')))
});
arr2.forEach(function(obj2) {
  var i = firstPart.indexOf(obj2.substring(0, obj2.indexOf('-')));
  if (i !== -1)
    arr1.splice(i, 1);
});
console.log(arr1)

answered May 9, 2017 at 10:42

Yashar Aliabbasi

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Comments

Mokkun · Accepted Answer · 2017-05-09 10:28:46Z

0

Make a loop that compare each values of Array1 against each values of Array2 and split your string like so array1[i].split("-"); to only compare the first part of your string

answered May 9, 2017 at 10:28

Mokkun

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Comments

C14L · Accepted Answer · 2017-05-09 10:38:26Z

0

Prepare your lookup array by splitting off the interesting bit

var arr2_prepared = arr2.map(x => x.split(' - ')[0]);

Then filter out the elements from the data array that do not have the first part of their strings in the lookup array

var result = arr1.filter(x => arr2_prepared.indexOf(x.split(' - ')[0]) === -1);

answered May 9, 2017 at 10:38

C14L

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