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tunnckoCore/bun-modifies-original-arrays.ts

Created October 30, 2025 22:58
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wut?!
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bun-modifies-original-arrays.ts
const foo = [
{ name: "Alice", age: 25 },
{ name: "Bob", age: 30 },
{ name: "Charlie", age: 35 },
{ name: "David", age: 40 },
];
export type Item = { name: string; age: number };
export async function foobar(collection: Item[]) {
const items = [...collection] as (Item & { glitched: boolean })[];
items.forEach((item, index) => {
const itemNumber = index;
if (itemNumber >= 1 && itemNumber <= 3) {
item.glitched = true;
} else {
item.glitched = false;
}
});
return items;
}
const newFoo = await foobar([...foo]);
console.log("original foo:", foo);
console.log("new foo:", newFoo);
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