ref type description >= 1.0.0

:ref type refers to other fields, and is generally used to combine the values ​​of multiple fields.

• & followed by a reference path, the main data attribute of the :ref type is the referenced path. The path is written in a similar way to xml's xpath. Multiple paths are separated by commas ,. If a single path is referenced, the value corresponding to the path will be directly assigned to the :ref field, if there are multiple paths, an array of multi-path values ​​will be generated. In addition, it is important to note that :ref is immediately-invoked value, which means that if the reference path appears after the :ref field, the value of undefined will be obtained will trigger an error after version v1.1.1; if the reference path corresponds to the same-level field of the array, it will get the value of the current sibling field in same indexed.

• From version v1.1.1, the path string supports \ to escape special characters, so that it is convenient to support fields containing special characters when corresponding to data field paths.

Such.as({
  firstName: "Michael",
  lastName: "Jordan",
  fullName: ":ref:&./firstName,./lastName:@join(' ')",
});
// Output is similar to below:
// {firstName: "Michael", lastName: "Jordan", fullName: "Michael Jordan"}