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Calculate the average score
const getContent = () => Deno.readTextFile('./example_data.txt')
const calculateAverageScore = (getContent: () => Promise<string>) => getContent().then(result => {
const lines = result.split("\n")
.map(l => l.split(","))
.filter((_, i) => i !== 0)
const scores = lines.map(l => Number(l[3]))
return scores.reduce((a, c) => a + c) / scores.length
})
console.log("Average score: " + await calculateAverageScore(getContent))
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