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116 lines
2.6 KiB
Markdown
116 lines
2.6 KiB
Markdown
---
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id: 699c8e045ee7cb94ed2322dd
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title: "Challenge 222: Equinox Shadows"
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challengeType: 28
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dashedName: challenge-222
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---
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# --description--
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Today is the equinox, when the sun is directly above the equator and perfectly overhead at noon. Given a time, determine the shadow cast by a 4-foot vertical pole.
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- The time will be a string in `"HH:MM"` 24-hour format (for example, `"15:00"` is 3pm).
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- You will only be given a time in 30 minute increments.
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Rules:
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- The sun rises at 6am directly `"east"`, and sets at 6pm directly `"west"`.
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- A shadow always points opposite the sun.
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- The shadow's length (in feet) is the number of hours away from noon, cubed.
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- There is no shadow before sunrise (before 6am), after sunset (6pm or later), or at noon.
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Return:
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- If a shadow exists, return `"(length)ft (direction)"`. For example, `"8ft west"`.
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- Otherwise, return `"No shadow"`.
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For example, given `"10:00"`, return `"8ft west"` because 10am is 2 hours from noon, so 2<sup>3</sup> = 8 feet, and the shadow points west because the sun is in the east at 10am.
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# --hints--
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`getShadow("10:00")` should return `"8ft west"`.
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```js
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assert.equal(getShadow("10:00"), "8ft west");
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```
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`getShadow("15:00")` should return `"27ft east"`.
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```js
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assert.equal(getShadow("15:00"), "27ft east");
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```
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`getShadow("12:00")` should return `"No shadow"`.
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```js
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assert.equal(getShadow("12:00"), "No shadow");
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```
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`getShadow("17:30")` should return `"166.375ft east"`.
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```js
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assert.equal(getShadow("17:30"), "166.375ft east");
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```
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`getShadow("05:00")` should return `"No shadow"`.
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```js
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assert.equal(getShadow("05:00"), "No shadow");
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```
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`getShadow("06:00")` should return `"216ft west"`.
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```js
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assert.equal(getShadow("06:00"), "216ft west");
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```
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`getShadow("18:00")` should return `"No shadow"`.
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```js
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assert.equal(getShadow("18:00"), "No shadow");
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```
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`getShadow("07:30")` should return `"91.125ft west"`.
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```js
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assert.equal(getShadow("07:30"), "91.125ft west");
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```
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`getShadow("00:00")` should return `"No shadow"`.
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```js
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assert.equal(getShadow("00:00"), "No shadow");
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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 getShadow(time) {
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return time;
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}
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```
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# --solutions--
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```js
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function getShadow(time) {
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const [hourStr, minuteStr] = time.split(":");
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const hours = Number(hourStr);
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const minutes = Number(minuteStr);
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const timeInHours = hours + minutes / 60;
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if (timeInHours < 6 || timeInHours >= 18 || timeInHours === 12) {
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return "No shadow";
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}
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const hoursFromNoon = Math.abs(12 - timeInHours);
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const length = Math.pow(hoursFromNoon, 3);
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const direction = timeInHours < 12 ? "west" : "east";
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return `${length}ft ${direction}`;
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}
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```
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