# Class: updateOperators

## documents/probe. updateOperators

This is not actually a class, but an artifact of the documentation system

#### new updateOperators()

  These are the supported update operators

  Source:
    - documents/probe.js, line 1007

### Members

#### <static> $dec

  Decrements a field by the amount you specify. It takes the form `{ $dec: { field1: amount }`

  Source:
    - documents/probe.js, line 245

  ##### Example

      var probe = require("documents/probe");
      probe.update( obj, {'name.last' : 'Owen', 'name.first' : 'LeRoy'},
      {$dec : {'password.changes' : 2}} );

#### <static> $inc

  Increments a field by the amount you specify. It takes the form `{ $inc: { field1: amount } }`

  Source:
    - documents/probe.js, line 225

  ##### Example

      var probe = require("documents/probe");
      probe.update( obj, {'name.last' : 'Owen', 'name.first' : 'LeRoy'},
      {$inc : {'password.changes' : 2}} );

#### <static> $pop

  The $pop operator removes the first or last element of an array. Pass $pop a value of 1 to remove the last element in an array and a value of -1 to remove the first element of an array. This will only work on arrays. Syntax: `{ $pop: { field: 1 } }` or `{ $pop: { field: -1 } }`

  Source:
    - documents/probe.js, line 277

  ##### Example

      var probe = require("documents/probe");
      // attr is the name of the array field
      probe.update( data, {_id : '511d18827da2b88b09000133'}, {$pop : {attr : 1}} );

#### <static> $pull

  The $pull operator removes all instances of a value from an existing array. It looks like this: `{ $pull: { field: <query> } }`

  Source:
    - documents/probe.js, line 318

  ##### Example

      var probe = require("documents/probe");
      // attr is the name of the array field
      probe.update( data, {'email' : 'EWallace.43@fauxprisons.com'},
      {$pull : {attr : {"color" : "green"}}} );

#### <static> $push

  The $push operator appends a specified value to an array. It looks like this: `{ $push: { <field>: <value> } }`

  Source:
    - documents/probe.js, line 301

  ##### Example

      var probe = require("documents/probe");
      // attr is the name of the array field
      probe.update( data, {_id : '511d18827da2b88b09000133'},
      {$push : {attr : {"hand" : "new", "color" : "new"}}} );

#### <static> $unset

  Removes the field from the object. It takes the form `{ $unset: { field1: "" } }`

  Source:
    - documents/probe.js, line 265

  ##### Example

      var probe = require("documents/probe");
      probe.update( data, {'name.first' : 'Yogi'}, {$unset : {'name.first' : ''}} );