Get Random Values

Description

This operation returns the specified number of random values from a set.

Method

Backendless.Hive(hiveName).SetStore(keyName).getRandom(count): Promise<values[]>;

where:

Argument	Description
hiveName	Name of a hive where the operation is performed. String value.
keyName	Key name identifying a set. String value.
count	Optional parameter. Identifies the number of values to return in the response. Defaults to 1. When the parameter value is a positive number, the  returned array contains only unique values. When the parameter value is negative, the returned array may include duplicate values.

Return Value

An array containing random values from the set. The number of values in the array and wether it includes any duplicates is controlled by the count parameter.

Examples

Get a Single Value
The example below returns a random value from the 'cars' set.

await Backendless.Hive('transport').SetStore('cars').getRandom()

where:

Argument	Description
'transport'	Name of a hive where the operation is performed.
'cars'	Key name identifying a set.

Get Multiple Unique Values
The example below returns five random values from the 'cars' set.

await Backendless.Hive('transport').SetStore('cars').getRandom(5)

where:

Argument	Description
'transport'	Name of a hive where the operation is performed.
'cars'	Key name identifying a set.

Get Multiple Values with Duplicates

The example below returns four random values from the 'cars' set. Since the count parameter is a negative value, the response may include duplicate values.

await Backendless.Hive('transport').SetStore('cars').getRandom(-4)

where:

Argument	Description
'transport'	Name of a hive where the operation is performed.
'cars'	Key name identifying a set.

You can find a sample response below demonstrating the presence of identical values.

[  
    "Sedan",  
    "Crossover",  
    "Crossover",  
    "Hatchback"  
]

Codeless Reference

where:

Argument	Description
hive name	Name of a hive where the operation is performed.
key name	Key name identifying a set.
count	Number of random items to get.

This operation returns a list containing random values from the set. If the count parameter is a positive number, the returned list contains unique random values from the set. If the parameter is a negative number, the returned list may contain duplicates.

Consider the following Set storage:

The example below retrieves a random value from the "cars" set: