Lodash: How to simulate '_.intersectionWith' in plain vanilla Javascript? | Hashnode

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VignesH KumaR

Senior FrontEnd Dev @ Freshworks Inc.,

Jun 29, 2016

Lodash: How to simulate '_.intersectionWith' in plain vanilla Javascript?

Hi,

How to write an equivalent simple Javascript method for '_.intersectionWith' method of LodashJs library ?

    var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
    var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];

    _.intersectionWith(objects, others, _.isEqual);

    Output: [{ 'x': 1, 'y': 2 }]

Appreciate your help.

#lodash #javascript #undescore

Responses(1)

Here ya go:

function intersectionWith() {
  var comparator = arguments[arguments.length - 1];
  var others = [].slice.call(arguments, 1, arguments.length - 1);
  var first = arguments[0];
  var results = [];

  first.forEach(function(item) {
    if (results.find(function(result) { return comparator(item, result) })) {
       return;
    }

    if (others.every(function(other) {
        return other.find(function(otherItem) {
            return comparator(item, otherItem);
        });
    })) {
        results.push(item);
    }
  });

  return results;
}

And here it is in action with a shallow equal function: https://jsfiddle.net/shiftyp/7jevjxjr/

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Lodash: How to simulate '_.intersectionWith' in plain vanilla Javascript?

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