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2018-01-03 11:52:32 +00:00
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snippets/geometricProgression.md
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@ -7,14 +7,16 @@ Use `Array.from()`, `Math.log()` and `Math.floor()` to create an array of the de
Omit the second argument, `start`, to use a default value of `1`.
Omit the third argument, `step`, to use a default value of `2`.
``` js
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)) )
```js
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
);
```
```js
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
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
```