Calculate the average score

parseStuff.ts

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))