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81 lines
2.0 KiB
Markdown
81 lines
2.0 KiB
Markdown
---
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id: 68c1a929005bf54d342aa8d3
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title: "Challenge 56: Space Week Day 2: Exoplanet Search"
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challengeType: 28
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dashedName: challenge-56
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---
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# --description--
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For the second day of Space Week, you are given a string where each character represents the luminosity reading of a star. Determine if the readings have detected an exoplanet using the transit method. The transit method is when a planet passes in front of a star, reducing its observed luminosity.
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- Luminosity readings only comprise of characters `0-9` and `A-Z` where each reading corresponds to the following numerical values:
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- Characters `0-9` correspond to luminosity levels `0-9`.
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- Characters `A-Z` correspond to luminosity levels `10-35`.
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A star is considered to have an exoplanet if any single reading is less than or equal to 80% of the average of all readings. For example, if the average luminosity of a star is 10, it would be considered to have a exoplanet if any single reading is 8 or less.
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# --hints--
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`hasExoplanet("665544554")` should return `false`.
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```js
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assert.isFalse(hasExoplanet("665544554"));
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```
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`hasExoplanet("FGFFCFFGG")` should return `true`.
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```js
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assert.isTrue(hasExoplanet("FGFFCFFGG"));
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```
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`hasExoplanet("MONOPLONOMONPLNOMPNOMP")` should return `false`.
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```js
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assert.isFalse(hasExoplanet("MONOPLONOMONPLNOMPNOMP"));
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```
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`hasExoplanet("FREECODECAMP")` should return `true`.
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```js
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assert.isTrue(hasExoplanet("FREECODECAMP"));
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```
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`hasExoplanet("9AB98AB9BC98A")` should return `false`.
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```js
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assert.isFalse(hasExoplanet("9AB98AB9BC98A"));
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```
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`hasExoplanet("ZXXWYZXYWYXZEGZXWYZXYGEE")` should return `true`.
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```js
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assert.isTrue(hasExoplanet("ZXXWYZXYWYXZEGZXWYZXYGEE"));
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```
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# --seed--
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## --seed-contents--
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```js
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function hasExoplanet(readings) {
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return readings;
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}
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```
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# --solutions--
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```js
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function hasExoplanet(readings) {
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let total = 0;
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const values = readings.split('').map(c => parseInt(c, 36));
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total = values.reduce((sum, v) => sum + v, 0);
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const average = total / values.length;
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const threshold = average * 0.8;
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return values.some(v => v <= threshold);
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}
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```
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