Insert Before

Description

This operation inserts a new value before an existing value in a list.

Method

Backendless.Hive(hiveName).ListStore(keyName).insertBefore(valueToInsert, anchorValue): Promise<number>;

where:

Argument	Description
hiveName	Name of a hive where the operation is performed. String value.
keyName	Key name identifying a list. String value.
valueToInsert	New value to insert into the list. Can be of any JavaScript data type.
anchorValue	Value which is used as a position anchor. Must be a value that already exists in the list.

Return Value

The number of values in the list after the insertion operation.

Example

The example below inserts the value 'red' before 'blue' in the 'colors' list.

await Backendless.Hive('demoHive').ListStore('colors').insertBefore('red', 'blue')

where:

Argument	Description
'demoHive'	Name of a hive where the operation is performed.
'colors'	Key name identifying a list where the new value is inserted.

Codeless Reference

where:

Argument	Description
hive name	Name of a hive where the operation is performed.
key name	Key name identifying a list.
item	New item to insert into the list.
before item	Value which is used as a position anchor.

Returns he number of values in the list after the insertion operation.

Consider the following List storage:

The example below inserts the value "Ann" before "Bobby" in a list identified by the "testList" key name: