Geometric progression

OSCC · JavaScript, Math, Algorithm · Dec 28, 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((_, 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]```

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