helper.js

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helper.js
¶
```
const math = require('mathjs');
```

Finds the sum of all the elements in an array

const sum = (array) => {
  let total = 0;
  math.forEach(array, (val) => {

¶

Itterate through the array, adding to the total variable
```
    total += val;
  });
```
¶

Return the sum
```
  return total;
};
```
¶

Checks to if a matrix is unitary. Accepts a mathjs matrix or array, and returns true or false accordingly
```
const isUnitary = (matrix) => {
```
¶

A Square matrix is unitary if its conjugate transpose is equal to its inverse
```
  const givenMatrix = math.matrix(matrix, 'sparse');
```

Check if its Square

  if ((math.size(givenMatrix))[0] !== (math.size(givenMatrix))[1]) {
    return false;
  }

  const conjugateTranspose = math.transpose(math.conj(givenMatrix));
  const inverse = math.inv(givenMatrix);

  return math.deepEqual(inverse, conjugateTranspose);
};

module.exports = {
  sum: sum,
  isUnitary: isUnitary
};