Slenderize

Slenderize Map Function

Contributed By: Francisco Treacy

Source File on GitHub

This function allows for making a Javascript object thinner by deleting some of its properties. Useful in some scenarios to improve performance when dealing with large objects, and prevent VMs of running out of memory.

var slenderize = function (v, kd, arg) {
  
  // we obviously assume it's a JSON document
  v = Riak.mapValuesJson(v)[0];
  
  // arg must be an Array
  if (arg instanceof Array) {
    arg.forEach(function(prop) {
      delete v[prop];
    });
  } else {
    throw new Error("The provided argument must be an Array");
  }
  
  return [v];
}

Example Usage

db
 .add('flights')
 .map('Contrib.slenderize', ['passengers', 'tickets'])
 .run()