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Programming-Idioms

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Idiom #202 Sum of squares

Calculate the sum of squares s of data, an array of floating point values.

let s = data.iter().map(|x| x.powi(2)).sum::<f32>();
(defn square [x] (* x x))

(def s (transduce (map square) + data))
(defn square [x] (* x x))

(def s (->> data (map square) (reduce +)))
(defn square [x] (* x x))

(def s (reduce + (map square data)))
using System.Linq;
var s = data.Sum(x => x * x);
s = sum( data**2 )
import "math"
var s float64
for _, d := range data {
	s += math.Pow(d, 2)
}
def s = data.sum { it ** 2 }
sumOfSquares = sum . map (^2)
s = data.reduce((a, c) => a + c ** 2, 0)
import java.util.Arrays;
Arrays.stream(data).map(i -> i * i).sum()
uses math;
var
  data: array of double;
...
  s := SumOfSquares(data);
...
use List::Util qw(sum);
my $s = sum map { $_ ** 2 } @data;
s = sum(i**2 for i in data)
s = data.sum{|i| i**2}

New implementation...
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