30-seconds-of-code/snippets/geometricProgression.md

geometricProgression

Initializes an array containing the numbers in the specified range where start and end are inclusive and the ratio between two terms is step.

Use Array(Math.floor(Math.log(end/start)/Math.log(step))+1) to create an array of the desired length, Array.map() to fill with the desired values in a range. You can omit start to use a default value of 1. You can omit step to use a default value of 2. Returns a error when you try to use step = 1

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]
geometricProgression(256,2,1); //Gives error