16 lines
409 B
Markdown
16 lines
409 B
Markdown
### squareSum
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Squares each number in an array and then sums the results together.
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Use `Array.prototype.reduce()` to iterate over numbers and to declare an accumulator.
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Use `Math.pow()` to calculate power of each number and add all numbers into acculmulator.
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```js
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const squareSum = (arr) => arr.reduce((squareSum, number) =>
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squareSum + Math.pow(number, 2), 0);
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```
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```js
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squareSum([1, 2, 2]); // 9
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```
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