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Home / Miscellaneous / Find the difference between two arrays with JavaScript

Find the difference between two arrays with JavaScript

Find the difference between two arrays

Compare two arrays and display the difference between the two.

const firstArr = [5, 2, 1];
const secondArr = [1, 2, 3, 4, 5];

const diff = [
    ...secondArr.filter(x => !firstArr.includes(x)),					
    ...firstArr.filter(x => !secondArr.includes(x))
];
console.log('diff',diff) //[3,4]


function arrayDiff(a, b) {
    return [
        ...a.filter(x => b.indexOf(x) === -1),
        ...b.filter(x => a.indexOf(x) === -1)
    ]
}
console.log('arrayDiff',arrayDiff(firstArr, secondArr)) //[3,4]




const difference = (a, b) => {
    const setA = new Set(a);
    const setB = new Set(b);

    return [
        ...a.filter(x => !setB.has(x)),
        ...b.filter(x => !setA.has(x))

    ]
};

difference(firstArr, secondArr); //[3,4]
console.log('difference',difference(firstArr, secondArr))

Source

https://github.com/JSsnippets/JavaScript-snippets

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