CODEWITHSUNDEEP
javascript
qweqwe
qweqwe

Reputation: 161

array object deduplication. keep behind

let config = [{
    name: 1,
    state: 1,
    output: 'Y',
}, {
    name: 2,
    state: 1,
    output: 'A',
}, {
    name: 1,
    state: 100,
    output: 'Y',
}, {
    name: 2,
    state: 100,
    output: 'A',
}];


function unique(arr) {
    const res = new Map();
    return arr.filter((a) => !res.has(a.name) && res.set(a.name, 1))
}

console.log(unique(config))

It is reserved first, deleted behind,

But I need the behind, not the first.

how do I let it to keep behind and delete the first?

Upvotes: 0

Views: 69

Answers (1)

Jaromanda X
Jaromanda X

Reputation: 1

A combination of Object.values with Array#reduce

let config = [{
    name: 1,
    state: 1,
    output: 'Y',
}, {
    name: 2,
    state: 1,
    output: 'A',
}, {
    name: 1,
    state: 100,
    output: 'Y',
}, {
    name: 2,
    state: 100,
    output: 'A',
}];
let result = Object.values(config.reduce((acc, item) => (acc[item.name] = item, acc), {}));
console.log(result);

Upvotes: 1

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