whole_func_string: function copy (target, source) {
    for (var key in Object(source)) target[key] = source[key]
    return target
  }
func_code_string: function copy (target, source) {
    for (var key in Object(source)) target[key] = source[key]
    return target
  }
func_documentation_string: Copy properties from source to target.
  
  @param {Object} target
  Object to assign properties to.
  
  @param {Object} source
  Object to get properties from.
  
  @return {Object}
  New object.