Piramida

let input = 3;

let m = input * 2;
for (let i = 1; i < m; i++) {
    let c = i > input ? m - i : i;
    let p = "";
    for (let j = 1; j <= c; j++) {
        p = p + "*";
    }
    console.log(p);
}

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Piramida

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