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30-seconds-of-code/snippets/isArmstrongNumber.md
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2017-12-22 23:48:42 +01:00

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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.

const isArmstrongNumber = digits => 
  ( arr => arr.reduce( ( a, d ) => a + Math.pow( parseInt( d ), arr.length ), 0 ) == digits ? true : false )( ( digits+'' ).split( '' ) );
// isArmstrongNumber(1634) -> true
// isArmstrongNumber(371) -> true
// isArmstrongNumber(56) -> false