Function access

src/modules/jquery.js:3951–4007

(elems, fn, key, value, chainable, emptyGet, raw)

  // Multifunctional method to get and set values of a collection
  // The value/s can optionally be executed if it's a function
  var access = function (elems, fn, key, value, chainable, emptyGet, raw) {
    var i = 0,
      len = elems.length,
      bulk = key == null;

    // Sets many values
    if (toType(key) === 'object') {
      chainable = true;
      for (i in key) {
        access(elems, fn, i, key[i], true, emptyGet, raw);
      }

      // Sets one value
    } else if (value !== undefined) {
      chainable = true;

      if (!isFunction(value)) {
        raw = true;
      }

      if (bulk) {
        // Bulk operations run against the entire set
        if (raw) {
          fn.call(elems, value);
          fn = null;

          // ...except when executing function values
        } else {
          bulk = fn;
          fn = function (elem, _key, value) {
            return bulk.call(jQuery(elem), value);
          };
        }
      }

      if (fn) {
        for (; i < len; i++) {
          fn(
            elems[i],
            key,
            raw ? value : value.call(elems[i], i, fn(elems[i], key))
          );
        }
      }
    }

    if (chainable) {
      return elems;
    }

    // Gets
    if (bulk) {
      return fn.call(elems);
    }

    return len ? fn(elems[0], key) : emptyGet;
  };