Get the data from a array and arrange it to different structure of JS array

Question

I have a array and I need to get the data from that array and arrange a new array with different structure.

Array what I have

[[21,1],[22,2],[32,4],[35,6],[45,1],[82,1]]

Array what I need

[[0-10,0],[10-20,0],[20-30,3],[30-40,10],[40-50,1],[80-90,1] ]

can we do it using JavaScript?

Answer 1

You could divide the range value by ten and add the count value

const
    data = [[21, 1], [22, 2], [32, 4], [35, 6], [45, 1], [82, 1]],
    result = data.reduce((r, [v, c]) => {
        const i = Math.floor(v / 10);
        while (r.length <= i) r.push([`${r.length * 10}-${(r.length + 1) * 10 - 1}`, 0]);
        r[i][1] += c;
        return r;
    }, []);

console.log(result);

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