JavaScript: Remove duplicates from an array

A short, tested JavaScript example for remove duplicates from an array. Copy it and adjust the names and paths for your project.

JavaScript

const unique = [...new Set([3, 1, 3, 2, 1])];   // [3, 1, 2]

// objects by key
const byId = [...new Map(items.map(i => [i.id, i])).values()];

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