Nested loop vs hashmap

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Nested loop
const arr1 = [];

for(let i = 0; i <= 10000; i++){
	arr1.push(i)
}

for(let i = 0; i <= 10000; i++){
	arr1.find(elem => elem === i)
}
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Object lookup
const arr1 = [];

for(let i = 0; i <= 10000; i++){
	arr1.push(i)
}

const obj = {};

arr1.forEach(elem => {
	obj[elem] = elem;
})

for(let i = 0; i <= 10000; i++){
	obj[i]
}
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