Sum all numeric elements from array

sumAll

const assert = require('assert');

selfSum = a => (Array.isArray(a) && eval(a.filter(n => typeof n === 'number').join('+'))) | 0;

describe('TEST # 1 - selfSum()', function () {

    it('should, sum all numeric elements', function () {
        let arr = [1,2,3,4,5,6,'A'];
        assert.equal(selfSum(arr),21);
    });

    it('should, omit characters not numeric', function () {
        let arr = ['A','b','c'];
        assert.equal(selfSum(arr),0);
    });
});