What is the most effective way to assess if two JavaScript arrays contain the same values?

Question

What is the most effective way to assess if two JavaScript arrays contain the same values?

I am looking to specifically identify if the second array contains any values matching a value from the first array, rather than comparing the arrays as a whole. The goal is to return the value that matches in both arrays.

To clarify, comparing two arrays as a whole would involve:

array1 = [1,2,3];
array2 = [1,3,4];

console.log(JSON.encode(array1)==JSON.encode(array2));

In this scenario, the focus is on checking for matching values in array2 compared to array1, rather than determining if the arrays are overall equivalent. Any assistance with this is greatly appreciated!

javascript arrays

Answer 1

Answer №1

let numbers1 = [5, 10, 15],
    numbers2 = [5, 20, 25];

let hasAnyNumbersInCommon = numbers1.some(function(num) {
    return numbers2.indexOf(num) > -1;
});
console.log(hasAnyNumbersInCommon);

let commonNumbers = numbers1.filter(function(num) {
    return numbers2.indexOf(num) > -1;
});
console.log(commonNumbers);

Answer 2

let numbers1 = [5, 10, 15],
    numbers2 = [5, 20, 25];

let hasAnyNumbersInCommon = numbers1.some(function(num) {
    return numbers2.indexOf(num) > -1;
});
console.log(hasAnyNumbersInCommon);

let commonNumbers = numbers1.filter(function(num) {
    return numbers2.indexOf(num) > -1;
});
console.log(commonNumbers);

What is the most effective way to assess if two JavaScript arrays contain the same values?

Answer №1

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