start
to end
(both inclusive).Array.prototype.fill()
to create an array of all the numbers in the target range.Array.prototype.map()
and the exponent operator (**
) to raise them to power
and Array.prototype.reduce()
to add them together.power
, to use a default power of 2
.start
, to use a default starting value of 1
.const sumPower = (end, power = 2, start = 1) =>
Array(end + 1 - start)
.fill(0)
.map((x, i) => (i + start) ** power)
.reduce((a, b) => a + b, 0);
sumPower(10); // 385
sumPower(10, 3); // 3025
sumPower(10, 3, 5); // 2925
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