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Rooted by: Get iterated digit sum
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  • Code 
    const getIDS = n => [...n].reduce((r, x) => r + +x, 0)
     Test Cases 
    Test.assertEquals(getIDS('1345'), 13);
Test.assertEquals(getIDS('1'), 1);
Test.assertEquals(getIDS('12'), 3);
Test.assertEquals(getIDS('110'), 2);
Test.assertEquals(getIDS('011'), 2);
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  • Code
    • const getIDS = n => [...n].reduce((r, x) => r + Number(x), 0);
    • const getIDS = n => [...n].reduce((r, x) => r + +x, 0)