src/add.js

import pointwise2 from './pointwise2'
import spPointwise2 from './spPointwise2'
import Complex from './Complex'

const add = pointwise2((x, y) => x + y)
const sadd = spPointwise2((x, y) => x + y)

function cadd(x, y) {
  if (!(y instanceof Complex)) { y = new Complex(y); }
  if (x.im) {
    if (y.im) {
      return new Complex(add(x.re, y.re), add(x.im, y.im));
    }
    return new Complex(add(x.re, y.re), x.im);
  }
  if (y.im) {
    return new Complex(add(x.re, y.re), y.im);
  }
  return new Complex(add(x.re, y.re));
}

/**
 * Pointwise add
 * 
 * @export
 * @param {Number|Array|Complex|Sparse} m1
 * @param {Number|Array|Complex|Sparse} m2
 * @returns {Number|Array|Complex|Sparse}
 * @example 
 * 
 * add(1, 2) // 3
 * add([1, 2], [2, 2]) // [3, 4]
 * add([[2,1], [1,2]], [[2, 2], [2, 2]])) // [ [2 + 2, 1 + 2], [1 + 2, 2 + 2] ]
 */
export default function (m1, m2) {
  switch (m1.constructor.name) {
    case 'Complex':
      return cadd(m1, m2);
    case 'Sparse':
      return sadd(m1, m2);
    default:
      return add(m1, m2);
  }
}