14 lines
569 B
Markdown
14 lines
569 B
Markdown
### isArmstrongNumber
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Checks if the given number is an armstrong number or not.
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Convert the given number into 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`.
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```js
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const isArmstrongNumber = digits => ( arr => arr.reduce( ( a, d ) => a + Math.pow( parseInt( d ), arr.length ), 0 ) == digits ? true : false )( ( digits+'' ).split( '' ) )
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// isArmstrongNumber(1634) -> true
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// isArmstrongNumber(371) -> true
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// isArmstrongNumber(56) -> false
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```
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