como usar o geometricProgression no javascript es6
January 04, 2020
Initializes an array containing the numbers in the specified range where start
and end
are inclusive and the ratio between two terms is step
.
Returns an error if step
equals 1
.
Use Array.from()
, Math.log()
and Math.floor()
to create an array of the desired length, Array.prototype.map()
to fill with the desired values in a range.
Omit the second argument, start
, to use a default value of 1
.
Omit the third argument, step
, to use a default value of 2
.
const geometricProgression = (end, start = 1, step = 2) =>
Array.from({ length: Math.floor(Math.log(end / start) / Math.log(step)) + 1 }).map(
(v, i) => start * step ** i
);
geometricProgression(256); // [1, 2, 4, 8, 16, 32, 64, 128, 256]
geometricProgression(256, 3); // [3, 6, 12, 24, 48, 96, 192]
geometricProgression(256, 1, 4); // [1, 4, 16, 64, 256]