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87 lines
1.5 KiB
Markdown
87 lines
1.5 KiB
Markdown
---
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id: 69cfca90e8a0a6d4d6871c52
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title: "Challenge 268: Narcissistic Number"
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challengeType: 28
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dashedName: challenge-268
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---
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# --description--
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Given a positive integer, determine whether it is a narcissistic number.
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- A number is narcissistic if the sum of each of its digits raised to the power of the total number of digits equals the number itself.
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For example, 153 has 3 digits, and 1<sup>3</sup> + 5<sup>3</sup> + 3<sup>3</sup> = 153, so it is narcissistic.
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# --hints--
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`isNarcissistic(153)` should return `true`.
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```js
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assert.isTrue(isNarcissistic(153));
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```
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`isNarcissistic(154)` should return `false`.
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```js
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assert.isFalse(isNarcissistic(154));
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```
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`isNarcissistic(371)` should return `true`.
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```js
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assert.isTrue(isNarcissistic(371));
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```
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`isNarcissistic(512)` should return `false`.
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```js
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assert.isFalse(isNarcissistic(512));
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```
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`isNarcissistic(9)` should return `true`.
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```js
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assert.isTrue(isNarcissistic(9));
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```
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`isNarcissistic(11)` should return `false`.
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```js
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assert.isFalse(isNarcissistic(11));
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```
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`isNarcissistic(9474)` should return `true`.
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```js
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assert.isTrue(isNarcissistic(9474));
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```
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`isNarcissistic(6549)` should return `false`.
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```js
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assert.isFalse(isNarcissistic(6549));
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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 isNarcissistic(n) {
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return n;
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}
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```
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# --solutions--
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```js
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function isNarcissistic(n) {
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const digits = String(n).split('');
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const power = digits.length;
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const sum = digits.reduce((acc, d) => acc + Math.pow(Number(d), power), 0);
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return sum === n;
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}
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```
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