constant

Set a constant value.

Synopsis

constant(value)
Table 1. Legend
Syntax conventions Description
Lowercase and uppercase Literal keyword. Includes ().
Italics Variable value. Replace with a user-defined value.
[] Optional. Square brackets ( [] ) surround optional command arguments. Do not type the square brackets.
{} Group. Braces ( {} ) identify a group to choose from. Do not type the braces.
| Or. A vertical bar ( | ) separates alternative elements. Type any one of the elements. Do not type the vertical bar.
... Repeatable. An ellipsis ( ... ) indicates that you can repeat the syntax element as often as required.

Description

The constant() step is a map step that is often useful with choose() or coalesce() steps,.

Examples

Use constant(0) to designate zero as the value for any returns that are not a number, such as NaN (not a number):
g.V().hasLabel('person').as('person','starCount').
  select('person','starCount').
    by('name').
    by(coalesce(outE('reviewed').values('stars'),constant(0)).mean()).
  order().by(select('starCount'), decr)