artesanias/node_modules/underscore/cjs/tap.js

// Invokes `interceptor` with the `obj` and then returns `obj`.
// The primary purpose of this method is to "tap into" a method chain, in
// order to perform operations on intermediate results within the chain.
function tap(obj, interceptor) {
  interceptor(obj);
  return obj;
}

module.exports = tap;