Function filter

MathBox/mathbox-bundle.js:38274–38296

* Iterates over elements of a collection, returning an array of all elements * the callback returns truey for. The callback is bound to `thisArg` and * invoked with three arguments; (value, index|key, collection). * * If a property name is provided for `callback` the created "_.p

(collection, callback, thisArg)

     * // => [{ 'name': 'barney', 'age': 36, 'blocked': false }]
     */
    function filter(collection, callback, thisArg) {
      var result = [];
      callback = lodash.createCallback(callback, thisArg, 3);

      var index = -1,
          length = collection ? collection.length : 0;

      if (typeof length == 'number') {
        while (++index < length) {
          var value = collection[index];
          if (callback(value, index, collection)) {
            result.push(value);
          }
        }
      } else {
        forOwn(collection, function(value, index, collection) {
          if (callback(value, index, collection)) {
            result.push(value);
          }
        });
      }
      return result;
    }

    /**
     * Iterates over elements of a collection, returning the first element that