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25 lines
859 B
JavaScript
25 lines
859 B
JavaScript
/*
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Sum square difference
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The sum of the squares of the first ten natural numbers is 385,
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The square of the sum of the first ten natural numbers is 3025,
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Hence the difference between the sum of the squares of the first ten natural numbers and the square of the sum is 3025 - 385 = 2640.
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Find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum.
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*/
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const findSumSquareDifference = (elementsCount) => {
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const naturalNumbers = Array(elementsCount).fill().map((_, i) => i + 1)
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let sumOfSquares = 0
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naturalNumbers.forEach(number => { sumOfSquares += Math.pow(number, 2) })
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const sumOfNumbers = naturalNumbers.reduce((prev, current) => { current += prev }, 0)
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const squareOfSums = Math.pow(sumOfNumbers, 2)
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return squareOfSums - sumOfSquares
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}
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console.log(findSumSquareDifference(20))
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