sort.js

sort.js

import isarray from "./isarray";
import { ERRORTYPES as error } from "./error";

¶

SORT an array of objects.

sort(reference(reference: Array, …criteria : List)

The list will also be reduced into a single function which interprets the strings as pairs. The odd items are fields and the even ones are direction (ASC|DESC).
```
export default function sort(ref, ...criteria) {
```

reduce the criteria array into a function

  let makeComparer = () => {
    return function(a, b) {
      var result = 0;
      for (var i = 0; i < criteria.length; i = i + 2) {
        if (result !== 0) continue;

        var field =
            typeof criteria[i] === "string" ? criteria[i] : criteria[i] - 1,
          order = criteria[i + 1];

        if (a[field] < b[field]) {
          result = order ? -1 : 1;
        }

        if (a[field] > b[field]) {
          result = order ? 1 : -1;
        }
      }

      return result;
    };
  };

  if (!isarray(ref)) {
    return error.na;
  }

  return ref.sort(makeComparer());
}