functionfoundry/fn/filter.js

Pure function JavaScript library

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = filter;
// Copyright 2015 JC Fisher

// FILTER limits a range based on arrays of boolean values.
function filter(range) {
  for (var _len = arguments.length, filters = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
    filters[_key - 1] = arguments[_key];
  }

  // A filter is an array of true/false values.
  // The filter may be for rows or for columns but not both.
  // A array filter may only filter a range that covers a single row or a single column.

  function makefilter() {
    return function (value, index) {
      return filters.reduce(function (previousValue, currentValue) {
        if (previousValue === false) {
          return false;
        } else {
          return currentValue[index];
        }
      }, true);
    };
  }

  return range.filter(makefilter());
}
module.exports = exports["default"];