Suppose I have two arrays containing objects as follows:
var array1 = [{"key1":"value1"}, {"key2":"value2"}, {"key3":"value3"}],
array2 = [{"key4":"value4"}, {"key1":"value1"}, {"key5":"value5"}]
(please note that the structure of objects can vary)
What is the most effective method to extract all the objects that exist in both arrays?
I came across a similar question here: Finding matches between multiple JavaScript Arrays, but it doesn't exactly address my concern...
How can we extract all common objects from two arrays?
To achieve this, you can merge the logic from Simplest code for array intersection in javascript with Object comparison in JavaScript by avoiding the use of the identity operator ==:
var intersection = a1.filter(function(a) {
return a2.some(function(b) {
return Object.equals(a, b);
});
});
Select an appropriate Object.equals function that suits your specific needs.
What is the most effective method to accomplish this?
The efficiency of the method depends on the nature of your objects. If you can define a functional comparison mechanism enabling array sorting or if you can establish a consistent hashing function, there are quicker alternatives available than the approach mentioned above. Reference the responses provided in the referenced question for more insights.
If you want to locate the first duplicated item and then stop the process, you can achieve this by utilizing a combination of the .find methods:
const arrayOne = [{"x":"y"}, {"y":"z"}, {"m":"n"}], arrayTwo = [{"s":"t"}, {"x":"y"}, {"o":"p"}]
const compareObjects = (object1, object2) => JSON.stringify(object1) === JSON.stringify(object2);
const findFirstDuplicate = (arrayOne, arrayTwo) => arrayOne.find(item1 => arrayTwo.find(item2 => compareObjects(item1, item2)));
console.log(findFirstDuplicate(arrayTwo, arrayOne)); // {x: "y"}
To simplify the objects, you can use JSON.stringify() and then compare for intersection.
var array1 = [{"apple":"red"}, {"banana":"yellow"}, {"carrot":"orange"}],
array2 = [{"grape":"purple"}, {"apple":"red"}, {"kiwi":"green"}]
// Simplify objects in the second array
var stringifiedArray2 = array2.map(function(item) {
return JSON.stringify(item);
});
// Find intersecting objects
var commonObjects = array1.filter(function(item) {
return stringifiedArray2.indexOf(JSON.stringify(item)) !== -1;
});
The variable commonObjects will include the object {"apple": "red"}
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