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myArray.find(item => item.isAstronaut)
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[
{ id: 10, color: "red" },
{ id: 20, color: "blue" },
{ id: 30, color: "green" }
].reduce((acc, cur) => ({ acc, [cur.color]: cur.id }), {})
//output:
{red: 10, blue: 20, green: 30}
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const obj = {};
for (const key of yourArray) {
obj[key] = whatever;
}