17 lines
576 B
Markdown
17 lines
576 B
Markdown
### isArmstrongNumber
|
|
|
|
Checks if the given number is an Armstrong number or not.
|
|
|
|
Convert the given number into an array of digits. Use `Math.pow()` to get the appropriate power for each digit and sum them up. If the sum is equal to the number itself, return `true` otherwise `false`.
|
|
|
|
```js
|
|
const isArmstrongNumber = digits =>
|
|
( arr => arr.reduce( ( a, d ) => a + Math.pow( parseInt( d ), arr.length ), 0 ) == digits ? true : false )( ( digits+'' ).split( '' ) );
|
|
```
|
|
|
|
```js
|
|
isArmstrongNumber(1634) // true
|
|
isArmstrongNumber(371) // true
|
|
isArmstrongNumber(56) // false
|
|
```
|