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Fix typo to fit the context Fix typo add space Fix small typo Fix small typo Fix typo Fix typo Fix typo Fix typo Fix typo Fix typo Fix typo Update tail.md Fix typo Fix small typo Fix typo Fix typo Fix typo Fix typo Fix small typo Fix typo Fix small typo Fix typo Fix typo Fix typo Fix typo Fix typo Fix typo Fix typo Fix typo Fix typo
14 lines
575 B
Markdown
14 lines
575 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 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`.
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```js
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const isArmstrongNumber = digits =>
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( 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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