src/fiber.js
function copy(from, to) {
      var name;
      for (name in from) {
        if (from.hasOwnProperty(name)) {
          to[name] = from[name];
        }
      }
    }
function copy(from, to) {
      var name;
      for (name in from) {
        if (from.hasOwnProperty(name)) {
          to[name] = from[name];
        }
      }
    }
function copy ( from , to ) { var name ; for ( name in from ) { if ( from . hasOwnProperty ( name ) ) { to [ name ] = from [ name ] ; } } }
Helper function to copy properties from one object to the other.
Helper function to copy properties from one object to the other .